Fourteen children and one teacher were killed in a shooting Tuesday at Robb Elementary School in Uvalde, Texas.

Gov. Greg Abbott announced the death toll and named 18-year-old Salvador Ramos as the gunman. Ramos was killed by police officers responding to the scene, according to Abbott.

“He shot and killed – horrifically, incomprehensibly – 14 students and killed one teacher,” Abbott said. “The shooter was … an 18-year-old male who resided in Uvalde. It is believed that he abandoned his vehicle and entered into the Robb Elementary School in Uvalde with a handgun and he may have also had a rifle, but that is not yet confirmed."

The shooting comes one week after 10 people were shot and killed at a Tops Friendly Market in Buffalo, NY. 

A number of athletes took to social media to share their reactions upon hearing the tragic news. Boston Celtics star Jayson Tatum, New England Patriots running back Damien Harris, and ex-Patriots wide receiver Julian Edelman were among them.

Tuesday's shooting at Robb Elementary School is the deadliest elementary school shooting since the 2012 Sandy Hook massacre in Newtown, Conn.