A 24-year-old Czech student fatally shot his father, then killed 14 people and wounded 25 others at his Prague university on Thursday before possibly killing himself, police said, marking the country¡¯s worst-ever mass shooting.

The government declared a day of mourning across the central European country for Dec. 23 to remember the victims, decided at a special cabinet meeting with President Petr Pavel.

¡°I would express my great sadness along with helpless anger at the unnecessary loss of so many young lives,¡± Pavel said.