First Dog Bo Obama runs up the stairs of Air Force One at Andrews Air Force Base in Maryland on Thursday. Evan Vucci/AP
Palestinian boys cool off in the waters of a natural spring known as Ein al-Sultan, near the West Bank city of Jericho on Thursday. Mohamad Torokman/Reuters
A harbor seal relaxes in the water at the Cleveland Metro Parks Zoo on Thursday in Cleveland, Ohio. Tony Dejak/AP
Ezekiel Kemboi (l.) of Kenya and his compatriot Paul Kipsiele Koech compete in the men's 3,000 meters steeplechase event at the IAAF Diamond League athletics meeting at the Letzigrund stadium in Zurich, Switzerland, on Thursday. Michael Buholzer/Reuters
A reveller challenges a bull with flaming horns, known as "bou embolat", in a bullring during a town festival in Amposta, Spain, on Wednesday evening. Albert Gea/Reuters
Laborers work at a construction site of a gas pipeline in Noida, India, on Thursday. Parivartan Sharma/Reuters
PotashCorp mill general superintendent Trevor Berg holds a handful of chicklet potash at a potash holding center at the Cory mine facilities near Saskatoon, Saskatchewan. BHP Billiton is focusing on getting regulatory approval for its $39 billion bid for Potash Corp before trying in earnest to win over the Canadian company's shareholders, a source said on Thursday. David Stobbe/Reuters
Workers remove debris from a bridge washed out by flooding in the Double Springs community outside Cookeville, Tenn., on Thursday. Erik Schelzig/AP
US Marines wait for the all-clear signal from a medevac helicopter crew after dropping off an Afghan soldier near the town of Marjah in Helmand Province, Afghanistan, on Thursday. Bob Strong/Reuters
Kenya Wildlife Services (KWS) rangers secure a buffalo during their relocation from Solio Ranch to the Aberdare National Park in Central Kenya on Thursday. KWS Veterinary Department Capture Unit plans to move 200 buffalo and 400 other animals such as eland, oryx, impala, waterbuck, Thompson's gazelle, and warthog in the area to be spread out in two to three phases, according to a media release from KWS. Paul Wanjiru/Reuters
Flood-affected children sit on a bed outside their makeshift tent in Camp Karoon near Nowshera, Pakistan, on Thursday. The floods have affected 20 million people and about one-fifth of Pakistan's territory, straining its civilian government as it also struggles against Al Qaeda and Taliban violence. Aid groups and the United Nations have complained that foreign donors have not been quick or generous enough given the scale of the disaster. Mohammad Sajjad/AP
On Thursday, the Clipper Stad Amsterdam (c.) sails during the Sail-In Parade marking the beginning of Sail Amsterdam 2010, a nautical festival held every five years in Amsterdam, Netherlands. Toussaint Kluiters/Reuters
Cast members of "The Expendables", Jason Statham (l.), Sylvester Stallone (2nd l.) and Dolph Lundgren (3rd l.) react as cast mate Terry Crews poses with his shirt off for photographers on the floor of the New York Stock Exchange. The cast members from the film rang the opening bell at the New York Stock Exchange on Thursday. Brendan McDermid/Reuters
Ladaveon Butler from Washington, puts on one of the Washington Redskins player's helmet after the last day of their NFL football training camp at Redskins Park in Ashburn, Va., on Thursday. Alex Brandon/AP
Preparing the invitation list to next month's peace conference on Syria is a ticklish matter for the UN's special envoy. Both Iran and Saudi Arabia are influential, on opposite sides, in Syria's civil war. But the US has conditions for including Tehran.
The United Nation’s special envoy for Syria is pressing ahead to organize a peace conference to try to bring the devastating civil war to a close. But even if the invitation list can be worked out in coming days, it is virtually certain that some major players in the conflict won’t be at the table.