The Humboldt Park riot was the second major conflict between Puerto Ricans in Chicago and the Chicago Police Department. The riot began on June 4, 1977 and lasted a day and a half. Following the shooting deaths of two Puerto Rican men, locals (mostly young Puerto Ricans) battled Chicago police officers in Humboldt Park and in the streets surrounding. The riot led the community to hold the Division Street Puerto Rican Day Parade, which started in 1978.