An underground transformer exploded at the intersection of 3rd and Monroe streets in Wilmington next to the Adams Four Shopping Center around 12:30 p.m. on Thursday, June 29, 2017.

The force of the blast lifted and broke up a section of the street around a manhole cover.

Wilmington police and firefighters quickly cordoned off the area until Delmarva Power crews could arrive to assess the situation.

The blast tripped at least one other transformer in the city's Southbridge section, and according to Delmarva Power's outage map led to a brief power disruption stretching from Pennsylvania Avenue and Rodney Street southwest to Lobdell and Bradford streets.

Wilmington police officers were deployed where 4th street passes underneath I-95 to direct traffic at two major intersections where the signals were darkened.

Typically an underground blast of this kind will blow the manhole cover off.

In this incident the cover plate stayed in place and the force of the explosion lifted up the street itself, which seemed to even surprise some of the Delmarva Power workers dispatched to the scene.

TrafficWatch & News Reporter for WDEL/WSTW 1989 - 1993 and back again for Round Two starting in February, 2015 after spending a decade in Chicago and another six years in Boston.