At least 21 people have been wounded by a bomb explosion on a bus in south Jerusalem, Israeli police say, BBC News reported.
Two casualties were taken to hospital in a serious condition following the blast, near the Hebron Road.
A police statement said bomb disposal experts had determined that a device exploded in the back half of the bus.
Many of the injured were on the bus but others were in a passing car. The car caught fire along with a second bus that was empty.
The head of the emergency department at Jerusalem's Hadassah Medical Center told Israeli Army Radio that some of the injuries were caused by flying metal nails and nuts.
A police spokesman told Israeli Channel 2 television that investigators were still trying to determine who had planted the bomb.
He declined to confirm reports that one of the two people in a serious condition was not carrying any identification papers and was considered a suspect.