Concourse D at Hartsfield-Jackson Atlanta International Airport was evacuated after an explosion Tuesday morning, but has since reopened, reports CBS Atlanta.

Atlanta Fire Rescue spokeswoman Janet Ward says the incident briefly shut down power to part of the airport.

The explosion happened in a maintenance shed around 8:40 a.m.

Airport officials said it was a small electrical explosion near Gate D 21 at a ramp level maintenance shop.

There were no reported injuries, and there was no fire.

Passengers on the northside of Concourse D were evacuated to Concourse E, but have since been able to return to Concourse D.

There is still partial power outage in certain areas of Concourse D.

The cause of this explosion is currently under investigation.

Delta Air Lines spokesman Morgan Durrant said the airline is working with airport officials and others involved to determine the impact to Delta operations.

Though Atlanta is major Delta hub, the airline has only a handful of gates in Concourse D.

Durrant said at 10 a.m. Tuesday that Delta didn't know yet whether it would need to delay or cancel any flights, but would take those measures only as a last resort.