` ` It was not a terrorist attack , '' mayor says . 30 people taken to hospitals , including a man with serious injuries , official says . Blast collapses first floor 's ceiling ; fire crews searching for gas leaks . Buildings collapse , including those occupied by a film and TV studio and by Charles University .
`` It was not a terrorist attack , '' mayor says . 30 people taken to hospitals , including one man with serious injuries , official says . Blast collapses first floor 's ceiling ; fire department searching for gas leaks . Buildings evacuated , including those used by a film and TV school and by Charles University .