The officers hit the man in the face early Sunday and kicked him in the stomach before leaving him, according to a police report. The 21 year old was treated for stomach pain before being released from the hospital.

"The force was extreme, which is why they are under investigation," police spokesman Michael Merkle said. The department is investigating whether the officers intended to cause the man bodily harm, Merkle said.

The man, whom police would not identify, was reportedly drunk and refused to leave Berlin's Fan Mile, where hundreds of thousands have gathered to watch World Cup games on big screens. He then cursed the officers, witnesses told police.

There has been little trouble at Berlin's Fan Mile. Wednesday's Poland-Germany match drew 500,000 to the big screens, with less than 100 arrests for minor offenses, police said.

On Sunday in Munich, where Brazil beat Australia 2-0 to secure a place in the second round, authorities reported no major incidents.

Munich police spokesman Andreas Ruth said 33 people, including five Brazilians, were arrested Sunday for minor infractions such as ticket scalping and selling illegal merchandise.

"It was really only low-level crime _ no violence, no confrontations" Ruth said.