Hundreds of employees at Andersen Corp. in Bay-port were removed Thursday morning for several hours from a building at its headquarters because of a "potential threat to the site," the window maker said.
A search turned up nothing suspicious, said St. Paul Police Sgt. Paul Schnell, whose department assisted Bayport police.
"We were called to send three of our bomb-sweep dogs," Schnell said. After several hours, the dogs "found nothing."
Employees were then cleared to return to work shortly before noon, the company said in a statement.
The statement did not disclose any details about the threat, including who made it, how it was communicated or what motivated it.
Last week, Andersen said it would permanently eliminate 250 management and staff positions, more than half of them at its Bayport headquarters.
Also, Andersen eliminated 287 jobs a week earlier as part of the closing of a vinyl window manufacturing plant in Fall River, Mass.
Privately owned Andersen employs slightly fewer than 11,000 people nationally, 3,500 of them in Minnesota.