Police hunt Melbourne man believed responsible for four indecent assaults in less than two hours

Police have released images of a man wanted over the indecent assault of four women in less than two hours in Melbourne.

In the first incident, a 46-year-old woman was running along The Tan track around 6am on November 1 when she was approached from behind and assaulted by a man.

Just 25 minutes later, a 23-year-old woman was waiting at a tram stop on St Kilda Road when a man exposed himself to her.

As she tried to flee, the man sexually assaulted her.

Just after 7am, two women were approached and one was attacked by a man near the river at Chifley Drive, Maribyrnong.

Within 20 minutes, the man struck again when he grabbed a woman walking down Clarks Road in Keilor East. He indecently assaulted her before running off.

Detectives from the Melbourne Sexual Offences and Child Abuse Investigation Team are investigating and believe the same man is responsible.

Investigators have released CCTV footage and images of the man they wish to speak to as part of their investigation.

He is described as being Caucasian in appearance and aged in his 30s with a slim to medium build.

He was wearing a dark blue or navy blue t-shirt with a white emblem and dark pants.

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