New Castle County Police in Delaware say a collaborative effort involving investigators, professors and the community led to the identification of human remains found in Wilmington.
Police said the blast was likely caused by a car crash that ruptured a gas line.
The fourth in a series of monthly community cleanup events was being held near where the 110 and 105 freeways meet, and in Wilmington and South Los Angeles.
The wastewater tunnel has been the works for decades, under construction for five years already, but also under the public's radar, though not for a lack of trying by the county.
Over two dozen workers were able to safely escape following a tunnel collapse in the Wilmington area of Los Angeles Wednesday night.
Los Angeles police arrested a suspect accused of trying to kidnap an 11-year-old girl in an incident caught on surveillance video.