BOSTON — Two manholes exploded in downtown Boston on Thursday morning, forcing the evacuation of two buildings and sending one person to the hospital with burns, authorities said.

The explosions were reported around 8:30 a.m. near the High Street and Federal Street area in the Financial District.

The cause remains under investigation, but Deputy Fire Chief Brian Tully said at a news conference at the scene that there “may have been an overpressure situation.”

The fire department was also checking area buildings for smoke and possible elevated levels of carbon monoxide.

Electric utility Eversource also responded to assist with the investigation, spokesperson William Hinkle said. No utility crews were working in the area at the time, and no customers lost power, he said.