A storm cell, possibly a tornado, passed through Boeing’s Frederickson facility this morning, knocking down trees and power lines, overturning railcars, and damaging cars and at least one building.

Despite the damage, no one was injured, said Boeing spokesman Doug Alder.

Employees were told to stay where they were inside its buildings, while the storm passed through around 7:20 a.m.

Alder couldn’t confirm if the storm was in fact a tornado, saying, “I’ll leave it up to the weather experts to decide what it was.”

“Whatever it was passed between two buildings, and there’s quite a bit of damage in one of the parking lots where about two dozen cars’ windows were blown out,” Alder said.

Boeing officials are still assessing the damage, but Alder confirmed that one of the buildings had a partial roof tear, and three of five railcars on their way to Boeing’s plant were partially overturned during the storm.

As of 10 a.m., Alder was unsure whether all employees had returned to work.