The Hayward Police Department said on social media at 1:19 p.m. that the explosions happened at a house near Mandarin Avenue and Sumatra Street just east of Interstate Highway 880 in the city's Tennyson-Alquire neighborhood.
Multiple emergency vehicles were seen along Mandarin Avenue outside a home that had its garage area severely damaged. The public was being urged to avoid the area.
A house on Mandarin Street in Hayward is seen damaged after an explosion, July 3, 2025. KPIXWhile at the scene, police said a second explosion took place, prompting the evacuation of nearby residences. A witness told CBS News Bay Area there were at least three explosions.
In a press statement, police said preliminary findings indicated suspected manufacturing of illegal fireworks or explosives at the home. The Alameda County bomb squad was called in "due to the potential hazards posed by remaining explosive materials inside the home," police said.
Anyone with information about the case is asked to contact the Hayward Police Department at 510-293-7000, referencing case number 2025-0037761.
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