Chicago: An American Airlines plane caught fire on a runway at O’Hare Airport here, local officials said.

The 161 passengers and nine crew members were evacuated down emergency chutes on the left side of the plane while the wing on the right side burned,. “20 people reported minor injuries and were transported to the hospital to be evaluated,” American Airlines said in a statement.

According to the Federal Aviation Administration, American Airlines Flight 383 was departing from O’Hare and was headed to Miami when it experienced “a problem during takeoff.” American Airlines said the plane had an engine malfunction.

A large rounded piece of metal believed to have come from the plane smashed through the roof of a UPS facility on the airport grounds and bounced off the floor, according to an airport worker. “It looks like a piece of a turbine disk from a jet engine,” the worker said, adding it was too hot to touch.

Few people were inside the building at the time and no injuries were reported. The facility is filled with workers at night. Police secured the scene and turned it over to the National Transportation Safety Board, which was investigating the incident.

A Boeing 777 at Las Vegas International Airport in September 2015 aborted its take-off to London when one of its two engines failed. In October 2015, passengers aboard a Dynamic Airways 767-200 were forced to evacuate because of a fuel leak that caused a fire while the aircraft was about to take-off in Florida.

Both incidents are still under investigation by the National Transportation Safety Board (NTSB).