Arcing insulator responsible for Wednesday fire at Friendship Heights Metro station

A D.C. Metro station is back open after an electrical fire filled tunnels with smoke and caused major delays during the morning commute. The incident happened around 8 a.m. when emergency crews were called to the Friendship Heights Metro stop on the D.C. / Montgomery County line.

Smoke from an arcing insulator filled the underground station with haze causing many riders to turn around and exit the facility. Emergency crews entered and inspected the rail lines before reopening it to commuters.

All service to the station was suspended for about 30 minutes during the investigation.

Wednesday's incident occurred at the same location where a fire occurred on Saturday. That fire was caused by a foreign object that came into contact with the track's electrified third rail.

No injuries were reported and no one was hospitalized.