Phoenix police are investigating a shooting early Sunday morning in the downtown area that left four people injured, according to release from the Phoenix Police Department.

Police have arrested Keon Joubert, 22, as a suspect in the case, according to a press release.

Officers responded to the area of First and Washington streets about 2:15 a.m. regarding a shooting call. According to the release, when officers arrived, they found four adults, one man and three women, with at least one gunshot wound each.

All were transported to nearby hospitals. The man was listed in critical condition, while the three women all suffered non-life-threatening injuries.

Phoenix homicide detectives have assumed the investigation, which is ongoing.