CAMDEN — Police were outside the Camden Rite Aid on Monday night into Tuesday morning as a robbery was in progress, according to authorities.

A woman who said she works at the Rite Aid said a man walked in just before the 8 p.m. closing time and ordered everyone to get out. He was holding a large gun, she said. The woman added that the robber let everyone go except for a female pharmacist.

Police Chief Randy Gagne said before midnight that the person who had been held in the drugstore had been released and authorities hoped for a peaceful resolution of the situation.

FBI agents and a Northeast Mobile Health Services ambulance were at the scene.

Knox County Sheriff’s Office Chief Deputy Tim Carroll confirmed the robbery at 8:30 p.m. Monday and said he could not comment further.

The Maine State Police tactical team was at the pharmacy and asked those nearby to get out of the line of sight of the building.

Police closed off part of Route 1 in downtown Camden, between School Street and beyond Washington Street.

There were four robberies at the Rite Aid in Camden in 2011 and 2012.