gas

Burned cars are pictured in a highway in Ecatepec near Mexico city, on May 7, 2013. A gas tanker exploded in a Mexico City suburb on Tuesday, killing at least 18 people and damaging several homes and cars, an official said. AFP PHOTO/Victor RojasVICTOR ROJAS/AFP/Getty Images

Victor Rojas/Getty Images

Burning cars are pictured in a highway in Ecatepec near Mexico city, on Tuesday. A gas tanker exploded in a Mexico City suburb on Tuesday, killing at least 18 people and damaging several homes and cars

Palestinian protester throws back a tear gas canister fired by Israeli troops during clashes near the village of Deir Jarir near Ramallah

Mohamed Torokman/Reuters

A Palestinian protester throws back a tear gas canister fired by Israeli troops during clashes near the West Bank village of Deir Jarir on Friday

A police woman and paramedic wrap a thermo foil around a woman injured by a powerful gas blast on April  29, 2013 in Prague's historic center. The blast injured up to 20 people, four seriously, rescuers said, adding that it was possible some people were buried in the rubble. AFP PHOTO / MICHAL CIZEKMICHAL CIZEK/AFP/Getty Images

Michal Cizemichal Cizek/AFP

A policewoman and paramedic wrap a thermo foil round a woman injured by a powerful gas blast on Monday in Prague’s historic centre. The blast injured up to 20 people, four seriously, rescuers said, adding that it was possible some people were buried in the rubble.

Survival International demonstrators protest wearing gas masks outside the Peruvian Embassy in London, Britain, 23 April 2013. Worldwide protests took place in London, San Francisco, Berlin, Madrid and Paris calling for an end to the expansion of the Camisea gas project in Peru's Amazon rainforest.

Andy Rain/EPA

Survival International demonstrators wear gas masks as they protest outside the Peruvian embassy in London. Protests also took place in San Francisco, Berlin, Madrid and Paris, calling for an end to the expansion of the Camisea gas project in Peru’s Amazon rainforest.