At least 15 people — and possibly as many as 40 — were shot today at a Walmart in the city of El Paso, Texas, as Lt. Gov. Dan Patrick (R) told Fox News.

Patrick also said a 21-year-old man was taken into custody, the outlet reported. Other individuals are possibly in custody as well.

The shooter is from Allen, Texas, according to the El Paso, Texas, police chief during a press conference early Saturday evening.

Authorities said earlier in the day that they had received numerous reports of “multiple shooters.” That was then revised to one shooter.

Investigations are still ongoing.

The lieutenant governor did not reveal to Fox how many of the injuries were fatal — but as of 6:45 p.m. ET, the Associated Press was reporting that at least 15 people were killed.

A spokesperson for El Paso Mayor Dee Margo told ABC News that there were “multiple fatalities” as a result of the shooting.

The El Paso Police Department tweeted that blood was urgently needed for those who were injured.

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Updates are expected at a press conference at approximately 7:30 p.m. ET.

See the tweets below with more information.

“Police responded to reports of an active shooting at the Cielo Vista Mall area shortly before 11 a.m. and asked people to stay clear of the active scene,” Fox News reported.

“An El Paso police spokesman told reporters shortly before 1 p.m. that there was no longer an ‘imminent threat’ to the area.”

One witness told the outlet that his own mother died at the scene.

Former Rep. Beto O’Rourke (D-Texas), a presidential candidate for 2020, called the shooting “truly heartbreaking.”

“Stay safe, El Paso. Please follow all directions of emergency personnel as we continue to get more updates,” he tweeted.

And Mayor Pete Buttigieg of South Bend, Indiana, also a candidate for the Democratic nomination, tweeted the following:

This is a developing story and has been updated; check back for further updates.