Sri Lanka air force plane crashes. killing all 4 aboard

A Sri Lankan air force plane crashed on Friday, killing all four crew members on board, an air force spokesman said.

crash occurred in Haputale district in island's mountain regions, about 200 kilometers (124 miles) east of capital Colombo, said air force spokesman Capt. Gihan Seneviratne.

de included two pilots and two crew members aboard Chinese-built Y-12 aircraft, which was on an observation mission, Seneviratne said.

It wasn't immediately clear what caused crash.