MADISON, Wis. (AP) &045; A weekend of Halloween celebrations popular with college students resulted in more than 400 arrests, and police used bursts of pepper spray early Sunday to break up crowds of revelers.

Mayor Dave Cieslewicz suggested canceling the annual gathering. The downtown party near the University of Wisconsin-Madison attracts college students from across the Midwest, and has turned chaotic in the past. Last year, 455 were arrested.

&8220;Every year there’s a certain group of people who come hell-bent on starting an altercation of some kind and we can’t seem to shake that,&8221; Cieslewicz said. &8220;The only way to end it is to order State Street shut down, every business, for a couple of nights.&8221;

Police used officers on horseback early Sunday to move chanting and beverage-tossing revelers off State Street, a mile-long stretch of bars, restaurants and shops. The pepper spray was used after cups filled with beverages and ice were thrown at officers.

Most arrests were for alcohol-related offenses, including underage drinking, said Lt. Pat Malloy. He said the local detoxification center was filled to capacity and some people had to be taken to emergency rooms.

There were 269 arrests overnight and 178 the night before, Police Chief Noble Wray said.