It happened just before 2 a.m. in the area of Academy and Halsey streets.
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Video from NewsCopter 7 showed the intersection and several surrounding roads covered with muddy water.
Academy Street was closed between Broad and Washington streets.
Halsey Street was shut down from Market Street to Raymond Boulevard.
Motorists and commuters who use NJ Transit buses in the area were advised to expect detours and delays.
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The main was on a service line is for fire department use only, so drinking water was not affected, and all residents and businesses in the area maintained their water supply.
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