WorldCom ( WCOM) employees at three branch offices allegedly booked up to $4 million in phony commissions by taking credit for sales at different offices, a report said.

The voice and data carrier suspended three employees and froze the commissions of at least 12 as part of its investigation, The Wall Street Journal reported. WorldCom sees no impact on its earnings from the incident.

According to the story, two managers are alleged to have improperly boosted their sales teams' commissions, while one sales representative knowingly boosted her own commission. Team commissions are used to calculate managers' pay, the newspaper said.

The three suspended employees will either be fired or asked to resign, the Journal said. They include one of WorldCom's top revenue producers last year and another of the company's highest-ranked salespeople.