PRAGUE (AP) — The Czech Republic came to a standstill at midday Saturday as people across the country observed a minute of silence as part of a national day of mourning to honor the victims of the worst mass killing in Czech history.

National flags were half-staffed on public buildings and bells rang at midday. A mass was celebrated for the victims in St. Vitus Cathedral in Prague, the largest in the country. President Petr Pavel and speakers of both houses of parliament took part in the service, which was open to all.

“We are all still in shock in our own way,” said Prague Archbishop Jan Graubner. “We must clearly condemn what happened, but we must also look to the future.”

“No one should be left alone in these difficult moments,” said Milena Kralickova, rector of Charles University, in her address towards the end of the mass. Fourteen people were killed in the shooting at the university’s Faculty of Arts on Thursday.

Similar services were held in other cities and towns, while Christmas markets in several places were closed or their programs reduced due to tightened security measures.

The shooting at the university in the heart of the Czech capital also left 25 people injured before the gunman killed himself. Police and prosecutors said they had evidence that the 24-year-old gunman also killed his father and a man and a baby in Prague last week.

A sea of ​​candles lit up in front of a spontaneously erected memorial for the victims in front of the university headquarters.

“It was a terrible experience for all of us, but it still cannot be compared with what the victims had to experience at the time of the attack and what their loved ones have to experience now,” said Milos Vystrcil, speaker of the upper house of parliament, the Senate, one of those who came to light a candle.

“I think to help them at this point we express our support and that’s what we’re all doing now.”

The names of the 14 deceased are gradually being published. The university confirmed that there were two employees among them, including the head of the Institute of Musicology, Lenka Hlávková. Another first-year student, Lucie Spindlerova, told the daily Lidove noviny, where she also worked.

The shooter was Czech and a student at the Faculty of Philosophy. Investigators do not suspect any connection to extremist ideologies or groups. Officers said they believed he acted alone. His motive is not yet clear.

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.