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Police officers at a press conference in Orange, California, on April 1. Photo: Paul Bersebach/MediaNews Group/Orange County Register via Getty Images

Orange, California, police said Thursday that the gunman who killed four people — including a 9-year-old boy — and wounded another person at a business complex on Wednesday night knew the victims either through professional or personal relationships, according to AP.

The big picture: The incident in Orange was the third mass shooting in the United States in just over two weeks, following a shooting in Atlanta, Georgia, which killed eight people and another in Boulder, Colorado that ended with 10 people dead.

What we know: Police said the suspect, 44-year-old Aminadab Gaxiola Gonzalez, was also wounded during the shooting and was in critical but stable condition at a local hospital, though it is unclear if his injury was self-inflicted or if he was shot by police.

  • Police said Gonzalez had locked the gates to the business complex from the inside prior to the shooting, forcing responding officers to engage him from outside the building.
  • The fifth victim, a woman, was taken to an area hospital and is in critical but stable condition, according to AP.

What they're saying: "The preliminary motive is believed to be related to a business and personal relationship which existed between the suspect and all of the victims," Orange Police spokesperson Lt. Jennifer Amat said in a news conference Thursday, according to CNN.

  • "This was not a random act of violence," she added.

Gov. Gavin Newsom (D) tweeted Wednesday, "Horrifying and heartbreaking. Our hearts are with the families impacted by this terrible tragedy tonight."

Go deeper

Updated Apr 1, 2021 - Politics & Policy

Child among 4 killed in Southern California shooting

Police officers stand outside a building were multiple people were killed in a shooting in Orange, California on Wednesday. Photo: Patrick Fallon/AFP via Getty Images

A child was among four people killed in a shooting at an office building in Orange, Southern California, on Wednesday evening, authorities said.

Details: A female patient and the male suspect were both in critical condition at a local hospital with gunshot wounds following the shooting, Orange Police Department Lt. Jennifer Amat said at a briefing late Wednesday.

Rahm Emanuel questioned on murder of Laquan McDonald in confirmation hearing

Rahm Emanuel during a Senate Foreign Relations Committee confirmation hearing on Oct. 20. Photo: Sarah Silbiger/Bloomberg via Getty Images

Former Chicago Mayor Rahm Emanuel spoke about the murder of Laquan McDonald during his Senate confirmation hearing Wednesday to become the U.S. ambassador to Japan, saying that "there's not a day or a week that has gone by in the last seven years I haven't thought about this."

Catch up quick: McDonald was a Black teenager who was fatally shot 16 times by Chicago police during Emanuel's tenure as the city's mayor. The shooting triggered massive protests, both because of its nature and the fact that the officers' body-cam footage was concealed for years.

2 hours ago - World

Biden's ambassador nominee: "China is not an Olympian power"

Nick Burns testifying before the Senate Foreign Relations Committee. Photo: Sarah Silbiger/Bloomberg via Getty Images

President Biden's nominee to serve as ambassador to China delivered a stark assessment of the challenges the U.S. faces in confronting Beijing, but stressed that the rising superpower is "not all-powerful" and the West retains "substantial" advantages.

The big picture: Nicholas Burns, a retired career diplomat and former U.S. ambassador to NATO, used his confirmation hearing Wednesday to echo the growing bipartisan consensus that China poses "the greatest threat to the security of our country and the democratic world" in the 21st century.