ANN ARBOR, MI – The Ann Arbor Jaycees Summer Carnival shut down several hours early Friday night after multiple fights broke out at the carnival.

Police were called to the carnival, being held outside Pioneer High School, at about 8 p.m., June 21, after receiving several calls about large groups of attendees fighting each other, according to the Ann Arbor Police department.

It is unclear exactly how many people were involved in the fight or what spurred the fighting. No injuries were reported, and no suspects were arrested, police said.

The carnival, which was scheduled to operate until midnight, shut down early after the incidents, according to the Ann Arbor Jaycees Facebook page.

The fights were largely isolated to the carnival parking lot, a representative of the Ann Arbor Jaycees said. Additional security and Jaycee volunteers will be at the carnival Saturday and Sunday to insure attendee safety.

The carnival is scheduled to reopen at noon Saturday. The Summer Carnival ends Sunday, June 23, at 9 p.m.