Police officers guard a street in downtown Prague, Czech Republic, Thursday, Dec. 21, 2023. Czech police say a shooting in downtown Prague has killed an unspecified number of people and wounded others.
Prague, Czech Republic CNN  — 

A shooter killed at least 14 people and wounded 25 others at a university in Prague on Thursday in the deadliest mass shooting the Czech Republic has seen in decades.

Authorities believe the gunman, a 24-year-old man, died by suicide, Czech Police Chief Martin Vondrášek said Thursday evening, but added it had not yet been confirmed. The gunman, who police said was a student of the Faculty of Arts at Charles University, has not been formally identified because of the severity of his injuries, the chief said. Police have not named him.

Authorities are still investigating a motive in the rampage, which took place at the Faculty of Arts building of Charles University, in the center of the capital city. The area is popular with tourists and close to major attractions, just across the Vltava River from Prague Castle.

The shooter traveled to Prague from his hometown village of Hostouň, the police chief said.

As the violence broke out, some students locked themselves in classrooms to avoid the gunfire, police said. A picture shared on social media showed several people hiding on an outside ledge high up in a building.

The university was holding classes on Thursday and was due to go on Christmas break on December 23, according to a schedule on the university’s website.

Students are seen hiding on a ledge at Charles University.

Graduate student Jakob Weizman told CNN he was in a classroom with his professor when they heard what sounded like gunshots and screams. The 25-year-old locked the door and with his professor, began pushing furniture against it to create a barricade.

“After I made the barricade and locked the door, I hid under the desk and I was preparing myself for anything that could happen,” Weizman said. “I did not know if (the shooter) was going to come through the door or from the window.”

He took down the barricade only when police arrived, he said. Authorities escorted him down and out of the building, the student told CNN he saw blood on each floor. “It was very traumatizing,” he said.

Student barricades door as shooter goes on rampage, killing at least 15 in Prague university.

In a later news conference Thursday night, Vondrášek revised the number of people killed to 14, after previously saying 15 people had died. Of the 25 people injured, 10 were in serious condition, the police chief said.

The next update from authorities is expected Friday morning.

Shooter may be linked to other killings

The police chief said authorities had information about the shooter before the university killings, saying police received a tip he was traveling to Prague with the intention to take his own life.

Shortly afterward, they received information a deceased man was found in Hostouň, a town around 13 miles (21 km) west of Prague. The man is believed to be the shooter’s father.