PRAGUE (AP) — People in the Czech capital tried Friday to come to grips with the worst mass shooting in the country’s history, which left 14 people dead and dozens injured at a university building. The gunman is also believed to have killed his father earlier in the day and a man and a baby last week.

Political leaders, students, friends of the victims and others gathered to light candles at an impromptu vigil for the victims of Thursday’s shooting.

“Some of my friends study at the philosophy department at Charles University,” said Kristof Unger, a student who attended the vigil. “They were really traumatized by the shooting there and I just wanted to make them feel a little more comfortable.”

Robert Hanus, another participant at the vigil, said everyone should come together to take a stand against the attack. “This shouldn’t be normalized,” he said.

Among the crowd lighting candles was the university’s rector, Milena Kralickova. “The academic community is shocked, deeply shocked,” she said.

The gunman who killed himself as police approached was believed to be Czech and a student at Charles University.

Authorities said Friday that 13 people died at the scene of the accident in the Faculty of Arts and one died later in a hospital. A total of 25 people were injured, including three foreigners – two from the United Arab Emirates and one from the Netherlands. Authorities warned that the death toll could rise.

Interior Minister Vit Rakusan said police in Prague worked overnight and all 14 people who died had been identified. Authorities did not release names, but the Institute of Musicology confirmed that its director, Lenka Hlávková, was among the dead.

Petr Matejcek, the director of the regional police headquarters in Prague, said the unidentified gunman killed himself on the balcony of the university building as police officers approached him.

Police did not provide any information about a possible motive for the shooting. The interior minister said on Thursday that investigators did not suspect any connection to extremist ideologies or groups. Officers said they believed the shooter acted alone.

Prague police chief Martin Vondrasek said investigators believe the man killed his father on Thursday in his hometown of Hostoun, west of Prague. He said the gunman was also suspected of killing a man and his two-month-old daughter in Prague on December 15.

Police said the gunman legally owned multiple weapons and was heavily armed during the attack.

Previously, there was the country’s worst mass shooting in 2015, when a gunman opened fire in the southeastern town of Uhersky Brod, killing eight people before fatally shooting himself.

Charles University was founded in 1348 and the Faculty of Arts is one of its oldest educational institutions.

The building where the shooting took place is near the Vltava River on Jan Palach Square, a busy tourist area in Prague’s Old Town. It’s within walking distance of the picturesque Old Town Square, a major tourist attraction where a popular Christmas market attracts thousands of visitors.

Police said Friday they had increased security at schools and other “soft targets” – typically hard-to-secure public facilities – until at least Jan. 1 as a preventive measure. University rectors also said they would work with police experts on more preventative measures to increase security around campus.

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AP video journalists Fanny Brodersen and Hakan Kaplan from Prague contributed.