The teen believed to be behind a series of indecent assaults in Onehunga remains at large this week.

Last week police launched an 0800 number to help with an investigation into the series of assaults that have occurred in the Auckland suburb since October last year.

Women in the suburb reported being startled by the teen, aged between 12 and 16, who put his hands up their dresses or touched their crotches.

So far 12 assaults of women aged 21 to 52 have been lodged with police.

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Police have issued a stay safe flyer in Onehunga after a serial sex attacker has been on the loose. Photo / Supplied
Police have issued a stay safe flyer in Onehunga after a serial sex attacker has been on the loose. Photo / Supplied

The latest, dating back to April 17, Easter Monday, was reported following the launch of the dedicated phone line.

Today police said further calls had been made to the 0800 number, but that no other cases had been confirmed.

"We've had a few calls over the weekend and are continuing to work through the information provided," a police spokeswoman said. "We are not aware of any further incidents since Easter Monday."

The alleged offender was described as a teen, aged between 12 and 16, of slim build, with light brown hair that's potentially been dyed a yellow or brassy colour.

In many of the reported cases he'd been spotted wearing a grey hoodie and knee-length shorts. Residents in the suburb last week reported feeling fearful for their safety, with some signing up to self-defence classes.

If you have any information about the identity of the attacker call police on 0800 748 244.