A Maryland man was assaulted by two Oakland Raiders fans and suffered serious head injuries during Sunday’s game between the Raiders and Baltimore Ravens at M&T Bank Stadium, police confirmed to USA TODAY Sports.

Joseph Bauer, 55, became embroiled in an argument with two men near a concession stand at the end of the game, according to Baltimore police. The dispute then turned physical and Bauer was pushed to the ground, where his head hit the concrete and he lost consciousness.

Bauer remained in critical condition Monday afternoon, according to University of Maryland Shock Trauma Center spokesperson Karen Warmkessel.

"My brother is in critical condition on life support over a football game," the victim's sister, Susan Bauer, told The Baltimore Sun. "We're in shock over this."

Susan Bauer told The Sun her brother suffered a subdural hematoma, and that doctors said he had 30% chance of survival.

Police arrested Scott Smith, 30, of Mt. Vernon, N.Y., and Andrew Nappi, 31, of Eastchester, N.Y. Both were charged with first- and second-degree assault.

Baltimore police Det. Donny Moses told USA TODAY Sports that Smith and Nappi were Raiders fans. Moses added police are still investigating what led to the assault.

The Ravens issued a statement Monday saying they were gathering more information on the incident.

"Our sympathies and prayers go out to Mr. Joseph Bauer, his wife Sharon and the rest of his family. We have reached out to the family and have received a report on Mr. Bauer's condition.

"We are deeply concerned about this assault and are learning as much as we can about it. Safety for our fans is a top priority. Confrotational and inflammatory behavior is never tolerated and is unacceptable at Ravens home games."