A man opened fire inside a Walmart on Saturday, leaving at least 15 people dead and many others injured, investigators said.

Authorities said Patrick Crusius, 21, started shooting shortly after noon near the Cielo Vista Mall. The shooting started in a Walmart and continued toward the mall, which is nearby.

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Crusius was taken into custody by authorities. Jail records show he is facing capital murder charges, The Associated Press reported. The motive for the attack is unknown.

Here is what we know about Crusius:

  • The 21-year-old is from Dallas
  • He walked into the store carrying a rifle and wearing ear protection
  • He was the only gunman

The Associated Press contributed to this report.