A man who scammed people out of nearly $300,000 by pretending to be a police officer has been arrested.

On Monday the 25-year-old man, a UK national, was chased by police through Auckland central on foot.

The scam involved a call to a landline by someone pretending to be a police officer and providing a fake badge number.

There were 18 Aucklanders, aged between 56 and 90, with the majority over 80, allegedly duped out of money.

"The scam will always involve this so-called officer asking for financial information or asking you to withdraw cash to be collected as part of an investigation into banks," Detective Senior Sergeant Craig Bolton said.