Updated at 2:10 p.m.
A DTE Energy spokesman says it appears an underground electrical cable malfunctioned, and may have ignited a build-up of methane gas.
Len Singer says the explosion blew off some manhole covers outside the Max M. Fisher Music Center.
He says blast also caused some damage to the basement walls of Orchestra Hall. The area has been evacuated while repairs are under way.
The Max M. Fisher Music Center in Detroit was damaged in a gas explosion this morning. No injuries were reported.
However, the Sphinx15 Finals competition scheduled for 2 p.m. today has been moved to Hill Auditorium at the University of Michigan. The event will start at 2 p.m.
Michigan Radio is a sponsor of the talent competition for young black and Latino string musicians.