Police say a thief got away after two good Samaritans grabbed the wrong person on a northern New Jersey street.

The Samaritans were driving down a street in Plainfield when they saw what appeared to be a man assaulting a woman early Monday.

But it turns out the man was walking down the street when he said the woman robbed him of about $400 in cash and a gold chain.

Public Safety Director Martin Hellwig tells the Courier News of Bridgewater ( http://mycj.co/PA5muX) the suspect ran off when the passing motorists intervened.

Investigators are using videotape to try to identify the suspect.

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Information from: Courier News (Bridgewater, N.J.) , http://www.mycentraljersey.com