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.

• Amat said earlier that when police arrived at the two-story building on Lincoln Avenue about 5:30p.m. shots were being fired, and then an "officer-involved shooting occurred."
• The suspect was transported to the hospital in police custody, but Amat could not confirm whether his gunshot wound was self-inflicted.
• She said police were still investigating the incident and could not immediately provide further details on the victims or the suspect.

For the record: The tragedy in Orange, some 30 miles southeast of Los Angeles, is the third mass shooting to hit the U.S. in the past 15 days.

• On March 16, eight people, including six Asian women, were killed at a spa in Atlanta, Georgia.
• On March 22, 10 people were killed at a supermarket in Boulder, Colorado.

What they're saying: Gov. Gavin Newsom (D) tweeted, "Horrifying and heartbreaking. Our hearts are with the families impacted by this terrible tragedy tonight."

• Rep. Katie Porter tweeted. "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."

Editor's note: This article has been updated with new details throughout.