A pickup truck collided with a Southwest plane at Baltimore-Washington International Thurgood Marshall Airport on Monday morning.

The aircraft was pulling into its gate at the airport shortly before 1 a.m. on Monday morning when the ground vehicle slammed into the side of the plane.

“All of a sudden there was a smash, and it startled everyone. It was pretty loud,” passenger Christopher Pratt told NBC News 4 Washington. “The people across the aisle said a truck just smashed into the side of the plane.”

All 172 passengers exited the aircraft by stairs, and no injuries were reported. They were held for about half an hour before they were allowed to leave and get their bags, according to CBS Baltimore.

The Boeing 737 had left Fort Lauderdale on Sunday night about 45 minutes late. It arrived in Baltimore shortly after midnight and reached the gate after a half-hour of taxiing. Southwest said that the aircraft is currently out of service.

“As with any event, we will conduct an internal investigation to learn what happened in the interest of safety,” Southwest told Travel + Leisure in a statement. “It would be irresponsible to provide details until we've had time to thoroughly review the facts.”