LOS ANGELES (CBSLA.com) — Officials Friday warned the public to be wary of fake charities in the wake of Monday’s deadly bombings at the Boston Marathon.

A statement issued by the Ventura County Sheriff’s Office says hundreds of domain names were created shortly after the explosions that killed three people and left more than 180 people injured.

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“Some of those registered domain names will use this as an opportunity to take advantage of people’s good will by committing fraud,” the statement cautioned.

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Officials say many of the fraudulent websites may contain viruses or spyware.

Perpetrators may use social networking sites and even direct e-mails to dupe those wanting to offer financial support to the victims, the statement said.

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For fraud-prevention tips, visit the Federal Trade Commission’s website.