OLYMPUS DIGITAL CAMERAGetty ImagesDoing a good deed isn't always rewarded.

In fact, sometimes things go the other way, according to a story from the Associated Press.

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PLAINFIELD, N.J. (AP) - 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.