(NEXSTAR) — At least two individuals are dead and multiple children were rushed for treatment in the wake of an active shooting report that caused the lockdown of a Texas school district Tuesday, police said.

Uvalde Consolidated Independent School District tweeted shortly before 12:30 p.m. local time that there was an “active shooter” at Robb Elementary, and that the rest of the district was on lockdown.

At 1:06 p.m. Uvalde police announced that a shooter was in police custody.

Uvalde Memorial Hospital confirmed the two deaths and added that the facility received 13 children by ambulance for treatment.

“If you are not an immediate family member, we are asking you to refrain from coming to the hospital at this time,” the hospital wrote on Facebook.

Another hospital, University Health, said it was treating a child and an adult patient from Robb Elementary. The full death toll is not yet clear; police have planned a press conference for Tuesday afternoon.

Robb Elementary has an enrollment of just under 600 students.

A reunification site was set up at local civic center where Robb students are being transported to meet their parents.

Uvalde is about 85 miles west of San Antonio and 60 miles east of the southern U.S. border with Mexico.

This is a developing story; the Associated Press contributed to this report.