Green Party presidential candidate Dr. Jill Stein said she may have suffered a rib fracture after she says she was knocked to the ground and assaulted by police during her arrest at a pro-Palestine protest at Washington University in St. Louis.

“Today I have really sore ribs, I’m going to the emergency room to see whether I have a rib fracture because they were using their bikes as a weapon,” Stein said during a Sunday interview on “NewsNation Prime.” “Basically ramming the handles of the bike into our chests and into my ribcage and trying to flip us over.”

Stein, 73, who was arrested Saturday, spent six hours in police custody and is facing charges of assaulting a police officer. “I wiggled out of that assault, and was told by the officer that I was assaulting him, which is absolutely ludicrous,” Stein said.