OMAHA, Neb. (AP) — Omaha’s police chief says the person responsible for killing four people in three separate shootings last month is “an indiscriminate killer.”

Chief Todd Schmaderer said during a news conference Wednesday that the killer crossed racial and gender lines — an occurrence police don’t often see.

Officials announced the arrest of 26-year-old Nikko Jenkins on Wednesday in the killings. Those include 33-year-old Andrea Kruger on Aug. 21, 22-year-old Curtis Bradford on Aug. 19,29-year-old Jorge Cajiga-Ruiz and 26-year-old Juan Uribe-Pena on Aug. 11. All were shot in the head.

Jenkins is being held on $500,000 bond on separate threat and weapons charges.

He is scheduled to make his first court appearance on four first-degree murder counts and a slew of weapons charges Thursday afternoon.