Burger King customers visiting a drive-through restaurant had to run a gamut of abuse after pranksters succeeded in hacking into the outlet's wireless intercom system.

Investigators believe teenage practical jokers are behind the insults delivered to Burger King customers at an outlet outside Troy, Michigan over the last fortnight.

Officer Gerry Scherlink told reporters that one customer was told "You don't need a couple of Whoppers. You are too fat. Pull ahead."

In other instances customers have been told there is no food at the restaurant, he added. Profanity is a regular feature of these exchanges, according to local reports.

Police believe the practical jokers are broadcasting at close range. If caught the culprits will face misdemeanour charges.

Managers at the fast food outlet are reportedly looking into changing the frequency of their intercom system. ®