Footage shows that the Japan Coast Guard plane that collided with a Japan Airlines passenger jet at a Tokyo airport on Tuesday stopped on the runway for about 40 seconds before the collision.

An NHK camera at Haneda Airport recorded the plane as it entered the runway from a taxiway.

Communications records show that two minutes before the collision at 5:47 p.m. an air traffic controller told the Coast Guard plane to taxi to a holding position near the runway. There is also no record of the air traffic controller instructing the Coast Guard plane to enter the runway before the accident occurred.

Retired pilot Kobayashi Hiroyuki says that even though the Coast Guard plane was on the runway, it may have been difficult for the pilots of the JAL plane to see the smaller plane because it did not move.

"One question I have is why the Coast Guard aircraft needed to stop on the runway for more than 30 seconds," Kobayashi said. "Its external lights were very small in an environment where other lights on the runway were big and bright. Therefore, the JAL pilots may have not been able to see the Coast Guard plane because it wasn't moving."

Sources close to the investigation tell NHK the captain of the Coast Guard plane says he powered up the engines after receiving clearance for takeoff, and then his aircraft was hit from behind.

The sources also say the captain is adamant he was given clearance to enter the runway.

Coast Guard officials say they began removing some of the aircraft debris from the runway at around 4 p.m. on Thursday as police completed their on-site investigation.