Residents of San Mateo may have woken up to sounds that are similar to a gunshot this morning as police and federal agents served a series of search and arrest warrants with assistance from local police.

The search warrants were served by the federal Bureau of Alcohol, Tobacco, Firearms and Explosives with assistance from the San Mateo Police Department at multiple locations around 6 a.m.

Police said in a statement the noise that some residents may have heard came from “distractionary devices that produce a loud explosive like sound,” that can be misinterpreted as gunshots, but no shots were fired.

They referred further questions to the ATF.

“We are in the process of conducting law enforcement activities and for the safety of everyone involved we are unable to disclose any further information at this time,” ATF spokeswoman Alexandria Corneiro said in an email.

She added that the agency will release more details when it's able to.

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