The Czech government declared a day of mourning on Saturday after the massacre yesterday at the University of Prague with at least 15 dead and 25 injured.

Flags will fly at half-mast in all public buildings in the country and a minute’s silence will be observed in memory of the victims at noon.

The country’s president, Petr Pavel, expressed sadness and anger at the loss of so many lives.

Czech Prime Minister Petr Fiala said: “We are all shocked by this horrible act.”

David Kozak. who police say has been “neutralized”, is believed to have also killed his father and may be linked to the deaths of two people last week.

It is one of the worst mass shootings in recent European history.

The shooting began around 3:00 p.m. local time on Thursday at the Charles University School of Arts building in the center of the Czech capital.

The gunman opened fire in the corridors and classrooms of the building, killing people indiscriminately, while staff and students blocked the doors with furniture to prevent him from entering the classrooms.

Dramatic footage shared on social media shows people jumping into the air to save themselves from a great height as gunshots ring out.

Police say the gunman was a 24-year-old university student with no previous criminal record, although they add that a “vast arsenal of weapons and ammunition” was found.

Before the shooting, police had received a report that the suspect was believed to be heading to Prague from a nearby town with the intention of killing himself.

A short time later, the man’s father was discovered dead.