Dunedin police are investigating two incidents in which men exposed themselves to young people yesterday.

Yesterday a boy was followed home from Tahuna Normal Intermediate School by a man who was "touching himself" during the 4km walk.

Senior Sergeant Ben Butterfield said the man was in a black Toyota Corolla, and was described as being in his 50s, bald and wearing a blue top.

Last night a man was caught masturbating outside a flat on Grange St in the student area.

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The man ran away after he was seen by a female resident.

He had short hair and was a tall and middle-aged.

It was too early to tell if the incidents were connected, Butterfield said.

Anyone with information was urged to contact Dunedin Police on 03 471 4800, or anonymously via Crimestoppers on 0800 555 111.