Lewd act near Melbourne primary school

Melbourne primary school students have watched as a man unzipped his pants and performed a lewd act in the park beside their school.

The Coburn Primary School students noticed the young man during lunchtime on February 23 before watching him leave the park, police said.

The offender is believed to have returned to the Blackwood Drive Recreational Reserve playground in Melton on March 1 and was captured on CCTV, which was released on Wednesday.