Portland police evacuated their headquarters on Middle Street for two hours early Friday and called in the bomb squad to investigate a suspicious package left in the station lobby.

Police said someone discovered the package around 8 a.m. and, after reviewing surveillance footage, determined that a woman had left the item around 5:15 a.m.

The building was evacuated and a backup dispatch facility was opened as a precaution to handle incoming emergency calls, which usually go to the station.

The hazardous devices unit, with the help of explosive detection dogs, deemed the situation safe and the station was reopened about 10 a.m., police said. They would not say what was in the package.

After reviewing the surveillance images, police said they recognized the woman who left the item as Daniel Theriault, 20, of Portland.

Police said that Theriault was arrested following an unrelated incident in which she allegedly tried to steal a cellphone and assault a customer at the Starbucks on Middle Street later Friday morning.

Theriault faces one count of Class C terrorizing, a felony, as well as charges for burglary, theft and assault for the incident at Starbucks, along with one count of violating prior conditions of her bail, police said.