David Kozak, 24, killed 14 people and injured 25 during a rampage in which he targeted students at his university in Prague. They are now looking into whether he carried out another shooting.
A student who says he barricaded his door minutes before the shooter tried the handle is among those describing the day when 14 people were shot dead in the Czech capital
David Kosak had been musing about massacres and mass murder on social media in the weeks before the horror mass shooting, according to Czech local media