Orange mass shooting: How many people have died and what is known about the shooter?

Police say four people, including a child, are dead after a shooting at a business complex in Orange, California, on Wednesday.

Mass shooting in Orange: four killed | Updates and latest news

Four people have been killed, including a child, in a shooting on Wednesday at a business complex in Orange, California, police say.

A fifth victim has also been taken to hospital in a critical condition.

OPD: "Multiple victims at the scene including fatalities"

"Today at 5:30pm, the Orange Police Department responded to a call of shots fired at 202 W. Lincoln Ave," the Orange Police Department said in a statement.

"Officers arrived as shots were being fired and located multiple victims at the scene including fatalities. An officer involved shooting occurred.

"The situation has been stabilized and there is no threat to the public."

City of Orange Police Department's Lt. Jennifer Amat (right) gives a news conference about the shooting on Wednesday.

Male suspect hospitalized, police official says

In a press conference, Lieutenant Jen Amat of the Orange Police Department said a male suspect received a gunshot wound and is in hospital in a critical condition.

"I can tell you that we haven't had an incident like this in the city of Orange since 1997," Amat told reporters. "It's just such a tragedy for the victims, their families, our community and our police department."

Gov. Newsom: "Horrifying and heartbreaking"

California Representative Katie Porter said in a tweet: "I'm deeply saddened by reports of a mass shooting in Orange County, and I’m continuing to keep victims and their loved ones in my thoughts as we continue to learn more. My team and I will continue to monitor the situation closely."

Gavin Newsom, the governor of California, tweeted: "Horrifying and heartbreaking. Our hearts are with the families impacted by this terrible tragedy tonight."

Police to offer update on Thursday morning

Police are set to give another press conference on Thursday at 10 am PDT.