The gunman who killed four people, including a 9-year-old boy, at an Orange office park locked the gates to the complex with bike cable locks and was armed with a weapon as well as pepper spray and handcuffs, police said Thursday.

Authorities said the shooting occurred inside a real estate and manufactured home business, Unified Homes, and the gunman and victims were connected through business and personal ties. Wednesday’s attack was not random, they said.

Officers received five calls about shots fired at the business in the 200 block of West Lincoln Avenue starting just after 5:30 p.m. The officers encountered gunfire when they arrived and opened fire, Orange Police Lt. Jennifer Amat said.

Because the gates were locked, officers fired through them and wounded the gunman, Amat said. Two officers fired their weapons, said Kimberly Edds, a spokeswoman for the Orange County district attorney’s office, which investigates all police shootings in the county. Both officers were wearing body cameras.