Czech Republic marks a day of mourning for the victims of its worst mass killing

President of the Czech Republic Petr Pavel attends memorial service Saturday, for the victims of Philosophical Faculty of Charles University shooting in Prague, Czech Republic. (AP Photo/Petr David Josek)

PRAGUE — The Czech Republic came to a standstill at noon Saturday as people across the country observed a minute of silence for the victims of its worst mass killing that left 14 dead and questions about the shooter’s motive.