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The Orange County Sheriff’s Department conducted an emergency disposal Wednesday of explosive materials collected during the Fourth of July holiday.

The Sheriff’s Department said its bomb squad successfully detonated the material near the Frank R. Bowerman Landfill in Irvine. Additionally, they destroyed 20 pounds of black powder, which is a chemical explosive.

“Improvised explosives are susceptible to heat, shock and friction and cannot safely be stored, requiring an emergency controlled detonation,” the agency tweeted in the afternoon.

Residents were told prior to the detonation not to be alarmed if they heard loud explosive noises coming from the landfill area.

The explosives were detonated in “shot holes” dug into the ground, according to the Sheriff’s Department.

The Orange County Fire Authority, Orange County Health Care Agency and Orange County Sheriff’s Department tactical medics were on hand to ensure the safety of all involved.

An explosion occurred in South Los Angeles when police attempted to detonate a cache of illegal fireworks on June 30. The blast damaged multiple structures and injured more than a dozen people.