Anthony Segrave rides in his boat as he leaves his son's flooded home in the aftermath of Hurricane Isaac in Slidell, La., Friday, Aug. 31, 2012. Isaac is now a tropical depression. David J. Phillip/AP
Natasha Morgan (r.) and Domingo De Los Reyes (l.) wait outside the flood wall for a chance to return to their homes in Braithwaite, La., after Isaac flooded the community up to the roofs, Friday, Aug. 31, 2012. Isaac crawled into the central US on Friday, leaving behind a soggy mess in Louisiana. Gerald Herbert/AP
Barry Woolridge opens a ready-to-eat meal for his family at a shelter set up at Kentwood High School after Hurricane Isaac passed through Kentwood, Louisiana, August 30, 2012. Jonathan Bachman/Reuters
Molly Weisenbrger of New Orleans signs in residents seeking higher ground at a shelter set up at Kentwood High School after Hurricane Isaac passed through Kentwood, Louisiana, August 30, 2012. Jonathan Bachman/Reuters
Dogs wait in kennels after being rescued from a flooded home in Plaquemines Parish on August 30, 2012 in Belle Chasse, Louisiana. Ann Hermes/Staff
Flood evacuees wait for a ride to a nearby shelter in Belle Chasse in Plaquemines Parish on August 30, 2012 in Belle Chasse, Louisiana. Ann Hermes/Staff
Shrimp boat deck hand Eric Gaudet (l.) speaks with US Air Force Tech Sargents Alex Sattler(c.) and Michael Lemoine of Belle Chasse in Plaquemines Parish on August 30, 2012 in Belle Chasse, Louisiana. Gaudet did not evacuate initially and tied down the boats during Hurricane Isaac to ensure they wouldn't sink. Ann Hermes/Staff
A herd of cattle move to higher ground on LA-23 in Plaquemines Parish to escape the rising floodwaters in Belle Chasse, Louisiana. Ann Hermes/Staff
Clean up begins at the International House Hotel on Camp Street in the French Quarter after the overnight curfew lifts on August 30, 2012 in New Orleans, Louisiana. Ann Hermes/Staff
New Orleans residents line up for supplies at an open gas station with no power as the rain and wind begin to die down on August 29, 2012 in New Orleans, Louisiana. Residents all over the city were buying supplies at the few stores open before the sunset curfew imposed by the city. Ann Hermes/Staff
Business owner Billy Nguyen cleans the drain near his home near the Lower Ninth Ward as wind and rain from hurricane Isaac continue on Aug. 29, 2012, in New Orleans. Ann Hermes/Staff
Debris litters Canal Street in the French Quarter after the overnight curfew lifts on August 30, 2012 in New Orleans, Louisiana. Ann Hermes/Staff
High winds from hurricane Isaac are causing debris to fly along Canal Street, as well as widespread power outages, on Aug. 29, 2012, in New Orleans. Ann Hermes/Staff
A mandatory evacuation is put in place in Jean Lafitte in Louisiana's Jefferson Parish as hurricane Isaac reaches southern Louisiana on Aug. 28, 2012. Ann Hermes/Staff
The waves grow stronger on Lake Pontchartrain as hurricane Isaac rolls in on Aug. 28, 2012, in New Orleans. Ann Hermes/Staff
Jefferson Parish personnel secure a US Flood Control Tiger Dam in an effort to keep flood waters at bay as hurricane Isaac reaches southern Louisiana, on Aug. 28, 2012, in Jean Lafitte, La. Ann Hermes/Staff
Residents riding out Isaac purchase last-minute supplies at a Family Dollar store on Aug. 28, 2012, in Kenner, La. Ann Hermes/Staff
Residents riding out Isaac purchase last-minute supplies at a Family Dollar store, on Aug. 28, 2012, in Kenner, La. Ann Hermes/Staff
(L-r.) Walesa Kanarek, Marin Tockman, and Justin Kray (with his dog, Josa) watch from the walkway along Lakeshore Drive as the waves grow higher on Lake Pontchartrain as hurricane Isaac rolls in on Aug. 28, 2012, in New Orleans. Ann Hermes/Staff
Chris Rabin watches from a walkway along Lakeshore Drive as the waves grow higher on Lake Pontchartrain as hurricane Isaac rolls in on Aug. 28, 2012, in New Orleans. Ann Hermes/Staff
Store manager Angie Bernard watches the door as residents riding out Isaac purchase last-minute supplies at a Family Dollar store in Kenner, La., on Aug. 28, 2012. When asked by a shopper if she was staying, she replied, 'Oh yeah. Not here at the store, though, I'm going home.' Ann Hermes/Staff
Residents in St. John the Baptist Parish fill sandbags at the local fire station, on Aug. 28, 2012, in Reserve, La. Ann Hermes/Staff
Jaden Fabian cries as she is loaded into a car seat as her family evacuates their home in advance of tropical storm Isaac, which is expected to make landfall in the region of Plaquemines Parish, La., Tuesday, Aug. 28, 2012. Gerald Herbert/AP
Michael Brown (l.) and Damon Brown (r.), residents of St. John the Baptist Parish, fill sandbags at the local fire station on Aug. 28, 2012, in Reserve, La. Concerns about flooding are high in low-lying areas as tropical storm Isaac slows. Ann Hermes/Staff
Employees of the US Army Corps of Engineers inspect hydraulic pumps in preparation for impending tropical storm Isaac at the 17th Street Canal flood wall in New Orleans on Aug. 28, 2012. Jonathan Bachman/Reuters
Shira Edllan Gervasi, of Israel, puts her name on plywood protecting a storefront in Key West, Fla., in anticipation of tropical storm Isaac on Saturday, Aug. 25, 2012. Alan Diaz/AP
A line of traffic extends down Interstate 10 heading toward Baton Rouge, La., on Monday, Aug. 27, 2012, as many residents leave the New Orleans area in anticipation of tropical storm Isaac. Gerald Herbert/AP
Florida Gov. Rick Scott listens to Federal Emergency Management Agency Administrator Craig Fugate shortly after arriving at the state Emergency Operations Center in Tallahassee, Fla., Aug. 27, 2012. Phil Sears/Reuters
Dale Shelton waits to be taken to a shelter in Key West, Fla., Saturday, Aug. 25, 2012, as he prepares for the arrival of Tropical Storm Isaac. Alan Diaz/AP
Richie Moretti (l.) and Bette Zirkelback release a kemps ridley turtle into an indoor tank in Marathon, Fla., Saturday, Aug. 25, 2012 . The turtles were moved from outside tanks to safer indoor tanks for protection in anticipation of Tropical Storm Isaac, Saturday, Aug. 25, 2012. Alan Diaz/AP
A person braves the rain at Clarence Higgs Beach in Key West, Fla., as Tropical Storm Isaac hits the area on Sunday, Aug. 26, 2012. Isaac gained fresh muscle as it bore down on the Florida Keys, with forecasters warning it could grow into a dangerous Category 2 hurricane as it nears the northern Gulf Coast. Walter Michot/The Miami Herald/AP
Lowes employees, Robert Tucker (r.) and John Lucenti (l.) load plywood for Terry King, back, and Ofelia Murphy at Lowes in Fort Walton Beach, Fla., Saturday August 25, 2012. Nick Tomecek/Northwest Florida Daily News/AP
Simone Haug (l.) looks on as Mary Piszker kicks a section into place as they work on the finishing touches on a window shutter installation in front of a clinic named "Womankind", in preparation for the arrival of Tropical Storm Isaac in Key West, FL August 25, 2012. Andrew Innerarity/Reuters
A cat sits on a bed a flooded house after the passing of Tropical Storm Isaac in Port-au-Prince, Haiti, Sunday Aug. 26, 2012. Dieu Nalio Chery/AP
People react as they survey the damage in Jacmel, Haiti, a day after Tropical Storm Isaac brought rains and winds across the nation, Sunday, Aug. 26, 2012. At least seven people were killed by flooding in Haiti, including in tent cities filled with earthquake victims, and two others in the Dominican Republic. Patrick Farrell/The Miami Herald/AP
Residents stand in line to receive aid from International Organization for Migration (IOM) in a camp for displaced people in Port-Au-Prince, August 26, 2012. Reuters
A resident receives aid from International Organization for Migration (IOM) in a camp for displaced people in Port-Au-Prince, August 26, 2012. Tropical Storm Isaac emerged over warm Caribbean waters on Saturday slightly weaker but ready to regroup after dumping torrential rains on Haiti, where thousands of people remain homeless more than two years after a devastating earthquake. Reuters
Biloxi resident Stephanie Dale (l.) holds her puppy, Sparky, while filling out paperwork to have her microchipped on Sunday, Aug. 26, 2012, at the Humane Society of South Mississippi in Gulfport, Miss. The HSSM opened its doors to provide an emergency microchip and tag clinic in anticipation of Tropical Storm Isaac. Amanda McCoy/The Sun Herald/AP
A man smiles from inside his home as floodwaters rise after Tropical Storm Isaac hit Barahona, Dominican Republic, Saturday, Aug. 25, 2012. Authorities said they evacuated nearly 3,000 people from low-lying areas, and at least 10 rural settlements were cut off by flooding. Power was out in parts of the capital, Santo Domingo, but there were no reports of injuries. Ricardo Arduengo/AP
Deacon Peter Batty (l.) prays at the Basilica of St Mary's Star of the Sea's Lourdes Grotto in Key West, Fla., August 25, 2012. A plaque at the grotto states as long as the grotto stands, "Key West will never again experience the full brunt of a hurricane." Andrew Innerarity/Reuters
A newspaper headline is seen on the floor of the Republican National Convention in Tampa, Fla., on Sunday, Aug. 26, 2012, as weather forecasts continue to show Florida in the path of Tropical Storm Isaac. Lynne Sladky/AP
A man stands on a post with a stop sign as waves pass the seawall during the passage of Tropical Storm Isaac in Baracoa, Cuba, Saturday, Aug. 25, 2012. Ramon Espinosa/AP
Soldiers and civilians unload bed frames to a shelter as they prepare for the arrival of Tropical Storm Isaac in Siboney, Cuba, Friday, Aug. 24, 2012. Ramon Espinosa/AP
A home that was built twice within the last two years is left in ruins during the passage of Tropical Storm Isaac near the seawall in Baracoa, Cuba, Saturday, Aug. 25, 2012. Ramon Espinosa/AP
People ride a taxi as strong winds blow palm trees in Havana August 25, 2012. Desmond Boylan/Reuters
Researchers at Louisiana State University said oil found on two barrier island beaches is a match with oil from the 2010 Macondo well explosion.
Laboratory tests show that globs of oil found on two Louisiana beaches after Hurricane Isaac came from the 2010 BP spill.
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