MEDAN, Indonesia (AP) — Indonesia's air force said Wednesday it will investigate if the transport plane that crashed into a city neighborhood, killing 141 people, was violating orders by carrying paying passengers. A local military commander said the search for bodies had ended.

The dead included all 122 on the plane, including military personnel and family members, and people in a residential area of Medan city where the C-130 Hercules crashed shortly after takeoff on Tuesday, North Sumatra police Maj. A. Tarigan told TVOne station.

The cause of the accident is not yet known but the pilot was trying to return to the airport because of an engine problem. At Adam Malik Hospital where bodies were taken, regional military commander Edy Rahmayadai told reporters that the rescue operation involving hundreds of soldiers and police had finished.

The C-130 was carrying many more passengers than the military first reported. Initially, the air force said there were 12 crew members on the 51-year-old plane and did not mention passengers. It then repeatedly raised the number of people on board, indicating lax controls and raising questions about whether the plane was accepting paying passengers despite previous promises to crack down on the practice.

Hitching rides on military planes to reach remote destinations is common in Indonesia, a sprawling archipelago that spans three time zones. The plane had traveled from the capital, Jakarta, and landed at two locations before stopping over at Medan on Sumatra, one of Indonesia's main islands.

Air force chief Air Marshal Agus Supriatna told reporters the C-130 was only authorised to carry military personnel and their families. He said he would investigate allegations of paying passengers.