(KALAMAZOO) – Three men have been arrested in connection with an assault that happened in Kalamazoo.

According to WWMT TV, Caiden Adams of Kalamazoo, Isaiah Hinojosa of Mendon and Salvador Alcantar Jr., of Three Rivers have all been charged with aggravated assault. They are being held in the Kalamazoo County Jail.

The Kalamazoo Department of Public Safety says the alleged assault took place on April 13 on West Michigan Avenue near Howard Street just after 6:30 PM. A man was knocked unconscious. Witnesses say the attack was unprovoked.

The victim was taken to a hospital to be treated for serious injuries.

Investigators say multiple tips lead them to the three men.