The Czech Republic declared Saturday a day of national mourning after a young gunman killed 14 people and wounded 25 at Prague's Charles University.
President Peter Pavel expressed his "great sadness" and "helpless anger at the completely unnecessary" loss of human life.
The shooting at Charles University is not related to terrorism and organized crime, Czech Prime Minister Petar Fiala said. He called the incident "a horrific act for which there is no justification" and expressed his condolences to the victims' relatives.
"This is the work of a lone person ... This is not an act of international terrorism or an organized group. I have been assured that the security forces are fully in control of the situation and there is no further danger to Czech citizens," Fiala told Czech Radio.
He said Saturday would be a day of mourning, adding that flags would be flown at half-mast on all public buildings and a minute's silence would be observed at noon in memory of those who died.
Many sporting and cultural events have been cancelled.
It is the worst mass shooting in the Czech Republic in decades, local media reported.
Czech police said at a briefing that the gunman had killed himself when police intervened. The person, whose identity has not been confirmed, killed his father before heading to the University. He was legally in possession of a weapon.
The violence in the historic city center prompted the evacuation of civilians from the area and the deployment of heavily armed police.
The shooting took place at the Faculty of Arts of Charles University, which is located near major tourist sites such as the 14th-century Charles Bridge.
The Bulgarian Foreign Ministry stated that there are no reports of Bulgarian citizens being injured.
"I can say at the moment that there are 11 dead at the scene, including the shooter," emergency services spokeswoman Jana Postova told Czech public television.
"The building is currently being evacuated and there are several dead and dozens of injured at the scene," the police said.
Emergency services initially reported 10 people with serious injuries, at least five with moderate injuries and up to 10 people with minor injuries.
The mass killing is the most tragic since the Czech Republic became an independent state in 1993.
Czech President Petar Pavel said he was "shocked" by the violence and expressed "deep regret and sincere condolences to the families and relatives of the victims".
European Commission President Ursula von der Leyen said she was "shocked by the senseless violence of the shooting that claimed several lives today".
Ukrainian President Volodymyr Zelensky expressed his condolences to the bereaved families.
"I wish the injured a speedy recovery," he added.
The White House condemned the "senseless" shooting at a Prague university and said the US was ready to offer help.
"The president and first lady are praying for the families who lost loved ones and for all others who were affected by this senseless act of violence," White House press secretary Karin Jean-Pierre told reporters.
Prague's emergency service announced that "a large number of ambulance teams" had been deployed to the faculty, adding that the injuries ranged from minor to very serious.
Interior Minister Vit Rakusan said there was no confirmation of a second shooter and urged people to follow police instructions.
Police cordoned off the area and asked those living nearby to stay home.
Although mass gun violence is uncommon in the Czech Republic, the nation has been rocked by some cases in recent years.
A 63-year-old man shot dead seven men and a woman in 2015 before killing himself in a restaurant in the southeastern town of Uherski Brod.
A man killed 6 people in a hospital waiting room in the eastern city of Ostrava in 2019, and another woman died days later. The man shot himself about three hours after the attack./BGNES
14 are the victims of the killer in Prague, December 23 is a day of national mourning
