The US space shuttle, Challenger, carrying seven astronauts, including a woman schoolteacher, exploded shortly after takeoff, Space Agency officials said. The officials said it was feared that all on board the shuttle vehicle had been killed. Mission control said the space vehicle exploded and pieces came down in the water about 14 km downrange from the launch site. The Prime Minister has already met Gorbachev on two previous occasions. Surprise shower in DelhiAn unexpected shower towards late evening sent Delhiites rushing for their raincoats and heavy woollens.