A loud boom heard in the Rosslyn area late Tuesday afternoon was the result of a blown transformer, authorities said.

Posts on social media described hearing the sound and seeing smoke coming up from grates around 4 p.m. in the area of Lynn and 19th streets.

Arlington County Fire Department spokesman Benjamin O’Bryant said it appears an underground transformer blew on Lynn Street. There were power outages in the area, but no reports of injuries, officials said.

Fire officials said they’re responding to stuck elevators. Police asked that motorists avoid the area because of snarled rush-hour traffic, although roads were reopened. There was no threat to public safety, police said.

A Dominion spokesman said the company was investigating the incident.

Metro said in a tweet there was no impact to service.

Rachel Weiner contributed to this report.