TOPSHAM — Firefighters are still at the scene of a fire that started late tonight at a Navy installation off Route 201 in Topsham.

A dispatcher for the Sagadahoc County Sheriff’s Department said the fire started in a vacant building at the Topsham Annex on Liberty Circle.

The dispatcher said the fire did not affect the military commissary which is also located at the Annex. The commissary provides food supplies at discounted rates to enlisted personnel and their families.

Topsham Annex is part of the Brunswick Naval Air Station, which is scheduled to close in May 2011.