Detroit fully restored power to downtown government buildings, schools, a hospital, traffic lights, and police and fire halls Tuesday after a major cable failure caused parts of the city to go dark for up to seven hours.

All customers of the municipal power system hit by the outage had power back, the city said at 5:15 p.m. The outage began at 10:30 a.m.

Mayor Mike Duggan said the power grid has not been modernized in decades in Detroit, emerging from the largest municipal bankruptcy in U.S. history. DTE Energy Co. is taking over the department and spending hundreds of millions upgrading the system over four years.

Among buildings that lost power was the city-county building, leaving dozens stuck in elevators. - AP