Police are searching for a man who dragged a six-year-old boy from a playground in Melbourne’s southeast before letting him go.

The boy was in the playground on Dempster Way in Narre Warren when he was approached by an unknown man about 5pm on Saturday, police say.

“The man grabbed the boy by the arm and dragged him approximately 50 metres towards Melzak Way,” police said in a statement.

He let go of the child when another adult approached him and then left the area with a young girl, believed to be known to him, police say.

The man was described as being of Indian sub-continental appearance and was wearing a black shirt, red shorts with a white emblem on the sides and glasses.

The boy wasn’t injured and police are treating it as an isolated incident.

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