At least 4 dead, 21 injured after shooting rampage in Texas; gunman dead

TEXAS — Police say at least four people were killed and 21 more injured, including three officers, when a gunman opened fire in Odessa and Midland, Texas.

Midland and Odessa are in West Texas, about 20 miles apart.

Police said the shooter was shot and killed. Police say the shooter was a white male in his 30s. Police originally said five people had been killed, but then said the shooter was included in the original number.

The three officers shot were a Midland officer, an Odessa officer and a Department of Public Safety officer.

Odessa Police Chief Michael Gerke spoke after a chaotic afternoon during which police reported that a suspect hijacked a U.S. Postal Service vehicle and began firing at random in the area of Odessa and Midland, hitting multiple people.

The first of the shootings began with a traffic stop by a Texas Department of Public Safety officer just after 3 p.m. local time, authorities said. The officer stopped a gold Honda with a traffic violation, according to police.

It was not clear what led to the traffic stop.

But after the vehicle came to a stop, the officer was shot, officials said.

That's when the suspect fled along I-20 toward Odessa, and kept shooting at people in multiple locations, authorities said.

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When he reached 42nd Street, he struck several more people, authorities added.

Along the way, the suspect ditched his car and allegedly stole the mail truck, police said. He then went toward Cinergy, a local entertainment center, and continued shooting.

Police engaged in gunfire with the shooter and he was killed. It's unclear if police shot the gunman or if he shot himself.

Hospital officials in Odessa said they had 13 patients total, with seven in critical condition. One of the patients initially brought to that hospital is under 2 years old.

The Department of Public Safety officer's injuries were not life-threatening.

The victims and the shooter have not been identified.

Police are still working to determine a motive.

It has been confirmed that the active shooter was shot and killed at the Cinergy in Odessa. There is no active shooter at this time. All agencies are investigating reports of possible suspects.

Posted by Midland Police Department on Saturday, August 31, 2019

It has been confirmed that the active shooter was shot and killed at the Cinergy in Odessa. There is no active shooter...

Posted by Midland Police Department on Saturday, August 31, 2019

President Donald Trump was briefed and the White House is monitoring the situation, Press Secretary Stephanie Grisham told ABC News.

Texas Gov. Greg Abbot released a statement, saying:

"The First Lady and I are heartbroken over this senseless and cowardly attack, and we offer our unwavering support to the victims, their families,and all the people of Midland and Odessa."

The tragedy comes exactly four weeks after a mass shooting killed 22 people at a Walmart in El Paso.

ABC News contributes to this report.