The Washington Monument will remain closed until at least Thursday as technicians repair a mechanical alignment issue with the elevator.

The issue is believed to be a result of multiple shutdowns caused by intermittent power losses in the past week, the National Park Service said.

The elevator lost power Sunday at 9:30 p.m., the National Park Service said. No visitors were inside the elevator at the time. One visitor on the observation level was escorted to the ground level via the stairs.

An electrical issue with the elevator also closed the monument last week.