A military transport plane blew a tire while landing, swerved off the runway and exploded at a southern Sudan airport Saturday, killing all 20 people on board, the army said.

The crash occurred at about 8 a.m. in Aweil, 525 miles southwest of Khartoum.

"One tire exploded while the plane was landing, a matter that made the plane deviate from the tarmac thus leading to its explosion," the Office of the Armed Forces was quoted as saying by the official Sudan Media Center.

The dead included seven crew members and 13 passengers, SMC said.

An army spokesperson could not be reached for comment.