Transformer fire at Moakley Courthouse

Updated.

A basement transformer fire forced the evacuation of the Moakley Courthouse this afternoon but caused no injuries.

The fire, reported around 4:15 p.m., went to a second alarm when the Boston Fire Department called in extra crews to evacuate courthouse workers.

Firefighters were unable to enter the transformer room for nearly an hour as they waited for NStar workers to arrive and shut off the power.