A person looks on as emergency workers fight a house fire after a near by fertilizer plant exploded Wednesday, April 17, 2013, in West, Texas. (Xinhua/AP Photo)

A paraglider sails past showing support for Prime Minister Datuk Seri Najib Razak as Najib submitted his nomination papers in Pekan on April 20, 2013. (Xinhua/AFP Photo)

A volunteer dressed with a Polar Bear costume takes part in an action by ... in Paris on April 20 to call on political leaders to protect the Arctic. (Xinhua/AFP Photo)

Chinese pianist Li Yundi receives interviews after his concert in Paris, France, April 15, 2013. Famous Chinese pianist Li Yundi was on his European tour started on March 18 ending in Berlin on May 14 en route Frankfurt, Munich, Paris, London, Liverpool, Moscow, Strasbourg, among others. Born in southwest China's Chongqing Municipality, Li was the youngest pianist to win the International Frederic Chopin Piano Competition in 2000, at the age of 18. (Xinhua/Gao Jing)

Justin Trudeau (R2), the eldest son of the late, long-serving Liberal Prime Minister Pierre Elliott Trudeau, celebrates with his wife and children after at the Liberal Party of Canada's leadership convention at the Westin Hotel in Ottawa, Canada, on April 14, 2013. Justin Trudeau was resoundingly elected leader of the centrist Liberal Party of Canada on Sunday. (Xinhua/David Kawai)

An unidentified man (in red) attempts to embrace Venezuela's President Nicolas Maduro (R) during his speech after Maduro was sworn into office, in Caracas April 19, 2013. Maduro was sworn in as Venezuela's president on Friday at a ceremony attended by several Latin American leaders, after a decision to widen an electronic audit of the vote took some of the heat out of a dispute over his election. In an embarrassing breach of security, a young man in a red jacket ran up to the podium, pushed the president out of the way and shouted into the microphone before being tackled by bodyguards. (Xinhua/Reuters Photo)

In this Thursday, April 11, 2013 photo, an Afghan woman holds her newly born baby wrapped in her burqa as she waits to get in line to try on a new burqa in a shop in the old town of Kabul, Afghanistan. Despite advances in women’s rights, Afghanistan remains a deeply conservative country and most women continue to wear the Burqa. But tradesmen say times are changing in Kabul at least, with demand for burqas declining as young women going to school and taking office jobs refuse to wear the cumbersome garments. (Xinhua/AP Photo)

The coffin of former British prime minister Margaret Thatcher is carried by the Bearer Party as it leaves St Paul's Cathedral after her funeral service, in London April 17, 2013. (Xinhua/AP Photo)

Local residents grieve during a candlelight vigil in the Dorchester neighborhood of Boston, Massachusetts April 16, 2013 where eight-year-old Boston Marathon bombing victim Martin Richard lived. A Little League baseball player, Martin lived in the blue Victorian house in working-class Dorchester - a Boston neighborhood dotted with "Kids at Play" traffic signs and budding trees - with his parents Bill and Denise, sister Jane, 7, and brother Henry, 10. Bill Richard told the world in an email on Tuesday that his son had been killed when bombs exploded at the marathon finish line. Martin's mother and sister were seriously injured.  (Xinhua/AP Photo)

A woman places a rose on the Titanic memorial during a service to mark the 101st anniversary of the sinking of the cruise ship April 15, 2013. (Xinhua/Reuters Photo)