The death toll of the El Paso Walmart shooting increased to 21 on Monday after a victim died at the hospital.

“Sad to report that the number of fatalities increased by one. Victim passed early this morning at the hospital,” El Paso police said in a statement on Twitter about 9:30 a.m. local time.

The shooting on Saturday afternoon left 26 wounded after a gunman attacked shoppers at a Walmart shopping center in El Paso, Texas, before being arrested in the latest mass shooting in the United States. 

El Paso police ruled out multiple shooters, and initial reports showed that the gunman used a rifle. The suspect, now in custody, was identified as a white male in his 20s. The rampage took place as shoppers were buying back-to-school supplies.