An Irish banker in the US on business went berserk in a New Jersey pizza parlor dragging a woman across the floor by the hair on her head and punching out another customer.

Police say the episode began when the Irishman, who was not named by police but said he worked for an Irish bank, got into an argument with the other customer in an Hoboken pizzeria, named by locals as Impostos.

He allegedly punched the man in the head and left him bleeding, according to reports.

As he was leaving, a 25-year-old local woman tried to stop him but he grabbed her by the hair and dragged her across the pizzeria floor.

Cops were called and when they arrived they confronted the 29-year-old man from Ireland who had deep scratch marks on his neck and blood on his shirt. He claimed he was trying to break up a fight.

The man said he was staying in nearby Montclair and worked for an Irish bank and was due to return to Ireland in two weeks He was arrested and held.

His two victims were treated in a nearby hospital.