More than a dozen visitors were stuck in the Penobscot Narrows Observatory Tuesday afternoon, July 2, when the elevator doors would not open, said Maine Department of Transportation spokesman Ted Talbot.

The 13 visitors, who had taken the elevator to the observatory located at the top of the Penobscot Narrows Bridge west tower in Prospect, were rescued by a member of the operations staff who brought them down the stairs after unlocking the doors, said Talbot.

The elevator was working properly, but Talbot said the DOT is still investigating what caused the doors to become stuck. The entire incident lasted around one hour and no one was injured.