SANTA ANA (CBSLA.com) — Police need the public’s help Wednesday to find a wanted robbery suspect.

Ernesto Antonio Guerra, 19, of Pomona, is wanted in a series of robberies throughout Orange County, Santa Ana police said.

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Police say Guerra and three other gang members from Ontario committed commercial robberies in Santa Ana, Anaheim and Garden Grove. Three of the four suspects are currently in custody and Guerra remains outstanding.

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Guerra is known to frequent the cities of Pomona, Ontario and Chino. Police say Guerra knows he is wanted and should be considered armed and dangerous.

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Anyone with information about Guerra can call Robbery Detective Art Castorena at (714) 245-8422 or Orange County Crime Stoppers at 1-855-TIP-OCCS.