Fifteen people have died in a shooting at a primary school in Texas, says Governor Greg Abbott.
The 18-year-old gunman killed 14 students and one teacher at Robb Elementary School in the city of Uvalde.
The governor said the suspect was armed with a handgun and possibly a rifle in the attack.
Governor Abbott says the suspect is deceased, and it is believed that responding officers killed him.
The public was asked to stay away as police investigate the crime scene.
Shootings at primary schools, where pupils range in age from five to 11, are still relatively rare.
The attack on Tuesday comes amid a national rise in gun violence.
Governor Abbott identified the attacker as a local 18-year old, who he said: “shot and killed, horrifically, incomprehensibly, 14 students and killed a teacher”.
“He is deceased, and it is believed that responding officers killed him,” he added.
“It is believed that two responding officers were struck by rounds, but have no serious injuries.”
The gunman may have also killed his grandmother at the beginning of the shooting rampage, according to local US media.
The Uvalde Consolidated Independent School District – around 85 miles (135km) west of the city of San Antonio – told the BBC that students had been evacuated from the school.
Local hospitals disclosed that students from the school were being treated by emergency services.
A 66-year-old woman was being treated at a hospital in San Antonio, and was in a critical condition, hospital officials said earlier.
The Uvalde Memorial Hospital posted on Facebook that 13 children had been taken to the hospital “via ambulances or buses”.
Two “individuals” were dead when they arrived at the hospital, the Facebook post said earlier.
Uvalde Mayor Don McLaughlin told ABC News in a text message “this is a very bad situation”.
The FBI is aiding in the investigation, according to CBS.
The last day of classes for students in the school district was scheduled for Thursday. Seniors at the local high school in Uvalde, a community of about 16,000 residents, are due to graduate on Friday.
Students have been evacuated to a local community centre image source, Reuters
Students have been evacuated to a local community centre
School shootings have become recurring emergencies in the US, with 26 recorded last year, according to EdWeek, an education trade publication.
Active shooter lockdown drills are a common part of the school curriculum, from primary to high school.
The 2012 shooting at Sandy Hook Elementary School in Connecticut shocked Americans. Twenty of the 26 victims in that attack, which was carried out by a 20-year-old, were between the ages of five and six.
A 2020 report from the US Government Accountability Office found that about two-thirds of all school shootings happen at the high school level and that shootings in elementary schools are most commonly accidental.