Police are appealing for the public’s help to track down the man responsible for sexually assaulting a 66-year-old grandmother, who was playing with her grandson in St Albans back in December.

The “extremely disturbing” incident occurred on a nature strip at the intersection of Alfrieda Street and Craigielea Avenue.

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The person of interest is perceived to be of African appearance, 175cm tall, and has a mark on the left side of his cheek and protruding teeth.

Anyone with information is urged to contact Crime Stoppers on 1800 333 000.

Images: Victoria Police