A plume of volcanic ash rises into the atmosphere from a crater under about 656 feet of ice at the Eyjafjallajokull glacier in Iceland on April 14. After the volcano's second eruption in less than a month, northern Europe turned into a no-fly zone on Thursday, stranding hundreds of thousands of passengers due to the huge amounts of ash. Olafur Eggertsson/Reuters
In Perth, Scotland, former British Chancellor of the Exchequer Ken Clarke reacts as he is greeted by a dog, Beckie, while campaigning ahead of the May 6 general elections. Andrew Millligan/AP
Kristina Lewis relaxes in a pen with her pig 'Goh-Goh' before the Junior Livestock Auction at the 72nd Annual Galveston County Fair & Rodeo on April 14 in Hitchcock, Texas. Kevin M. Cox/The Galveston county Daily News/AP
The STS-131 crew members pose for a portrait in the cupola of the International Space Station in this image provided by NASA. Pictured counterclockwise (from top left) are astronauts Alan Poindexter, James Dutton, Dorothy Metcalf-Lindenburger, Rick Mastracchio, Japan Aerospace Exploration Agency astronaut Naoko Yamazaki, astronauts Clayton Anderson and Stephanie Wilson. NASA/Reuters
First lady Michelle Obama waves as she boards an Air Force plane as she leaves Mexico City on Thursday. Dario Lopez-Mills/AP
Angie English (l.) and her husband Mike English of Adairsville, Ga., attend a tea party rally at Freedom Plaza in Washington on Thursday. Jacquelyn Martin/AP
US Park Police Officer Calvin Covington (l.) waits his turn in line with his horse, Harper, to mail his family's tax return at a mobile post office near the Internal Revenue Service building in downtown Washington on Tax Day, April 15. Jonathan Ernst/Reuters
Zhanybek Bakiyev (c., in uniform), former head of the State Guard Service and brother of Kyrgyzstan's deposed President Kurmanbek Bakiyev, is surrounded by bodyguards at a rally in Osh, Kyrgyzstan, on Thursday. Bakiyev is trying to gather support in the southern part of the nation, his traditional and clan power-base, but his efforts took a blow on Thursday when he tried to speak at a rally. Within a few moments of taking the stage, gunfire rang out and Bakiyev was hustled into a car and driven away. D. Dalton Bennett/AP
Elephants eat at Pinnawela Elephant Orphanage near Colombo, Sri Lanka, on Thursday. The elephant orphanage was established in 1975 by the Sri Lanka Wildlife department, and covers about 24 acres with some 69 elephants being cared for. Manish Swarup/AP
Bedouin children learn to ride bicycles in the Negev Desert village of Tarabin, Israel, on Thursday. The Israel Cycling Federation donated about 800 all-terrain bicycles to Bedouin children on Thursday as part of its project 'Bikes-4-All,' which collects used bikes for redistribution to those who can't afford new ones. Ariel Schalit/AP
A trained dog takes an Emergencies Ministry member ashore during exercises aimed at easing the consequences of spring floods near the village of Sengileyevskoye, Russia, on Thursday. Eduard Korniyenko/Reuters
A cloud of volcanic ash is seen spreading from the southern side of Iceland (top l.) in this satellite photograph on Thursday. After the volcano's second eruption in less than a month, northern Europe turned into a no-fly zone on Thursday, stranding hundreds of thousands of passengers due to the huge amounts of ash. Norwegian Met Office/Reuters
The United States and Bangladesh have promised more cooperation against violent extremism. Bangladeshi officials have been reluctant to acknowledge IS is active in the country, however.
ByMatthew Pennington, Associated Press
The taking of hostages by gunmen in Dhaka's diplomatic quarter is the latest in a string of attacks that have sparked international alarm and prompted the United States and Bangladesh to promise more cooperation against violent extremism in the Muslim-majority nation.