The tail cone of a Singapore Airlines (SIA) aircraft was damaged after it hit another plane that was being towed at Changi Airport on Monday evening. The incident was first reported by the Airline Hub Buzz website yesterday, and SIA later confirmed it. An SIA spokesman said there were no passengers on board the planes during the accident. No one on the ground was injured. "Damage to the aircraft is being assessed and investigations will be carried out to determine how the incident occurred," he added. Last October, the nose gear of an SIA plane retracted while it was undergoing a landing gear system check at Changi Airport, causing the plane to tilt forward. There were no passengers or crew on board at the time of the incident, but an engineer was on the aircraft. He was not hurt.