Police in Uvalde, Texas, where a gunman killed 19 students and two teachers at Robb Elementary School in May, said they were investigating a shooting at Uvalde Memorial Park on Thursday evening.

Two juveniles were injured and being treated at San Antonio hospitals, according to a statement from the Uvalde Police Department. The Texas Department of Public Safety said that the shooting is suspected to be “gang related.”

Four suspects were in custody for questioning Thursday night, police said.

Gov. Greg Abbott said Thursday evening he was dispatching six additional state trooper units to Uvalde to coordinate anti-gang efforts with city authorities. Additionally, the Texas Department of Public Safety is deploying special agents to target the five gangs operating in Uvalde.

“I was outraged to learn that gang violence has endangered the Uvalde community and innocent Texans this evening,” Abbott said.

The Uvalde Police Department said it got the call at about 5:30 p.m.

The shooting comes the same week that students in Uvalde went back to school for the first time since 19 of their fourth-grade classmates and two teachers were killed there on May 24. Robb Elementary is permanently closed and slated to be demolished. 

MORE:Uvalde community still reeling from school shooting