Capitol Police evacuated parts of the Longworth cafeteria for almost an hour Tuesday morning to investigate an unattended backpack.

The department responded to a call about a suspicious package at about 10:45 a.m., police spokeswoman Sgt. Kimberly Schneider said. The “immediate area was restricted— while the bomb squad investigated the bag, she said.

By 11:45 a.m., police had cleared the bag and reopened the cafeteria. Such false alarms are common: Police sometimes investigate several suspicious packages a day.