(WFLA) — At least 19 children and two adults were killed in a shooting at an elementary school in Texas on Tuesday, according to law enforcement.

The Texas Department of Public Safety confirmed Tuesday night that the death toll in the shooting at Robb Elementary School in Uvalde, Texas had risen to 20. Gov. Greg Abbott had previously confirmed the deaths of at least 14 students and one teacher.

According to law enforcement, the gunman is also dead. Gov. Abbott identified him as an 18-year-old man who lived in the community. According to the governor, the suspected shooter was armed with a handgun and possibly a rifle. Police said they believe he acted alone when he walked into the school and opened fire.

Uvalde Consolidated Independent School District first tweeted that there was an “active shooter” at the school just after 1:15 p.m. ET. Uvalde police announced the situation was no longer active just after 2 p.m.

Uvalde Memorial Hospital confirmed it received 13 children by ambulance and bus 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.

A message on the school district’s website asked parents of Robb Elementary students to not come pick their children up. A reunification site was set up for students to be taken to.

“Students need to be accounted for before they are released to your care,” the message read. “You will be notified to pick up students once all are accounted for.”

Police said the school has students who are in second, third and fourth grade. Enrollment for the school is just under 600.

The district’s last day of school before summer break was supposed to be Thursday. The superintendent said Tuesday night school was done for the year.

According to the White House, President Joe Biden was briefed Tuesday afternoon on the shooting. He is expected to address the country from the Roosevelt Room in the White House at 8:15 p.m. ET.

Biden issued a proclamation ordering flags to fly at half-staff “as a mark of respect for the victims of the senseless acts of violence.”

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.