( CNN ) -- A gas explosion ripped through a building containing offices and an art gallery in a historic district of central Prague on Monday morning , injuring 35 people and prompting evacuations of nearby buildings in the Czech capital , officials said . More than 230 people were evacuated from the area , including from buildings used by schools including Charles University and the Academy of Performing Arts ' film and TV school , known as FAMU , officials said . `` We can now confirm this was a gas explosion . It was not a terrorist attack , '' Prague Mayor Bohuslav Svoboda told reporters Monday . The blast at 5 Divadelni Street , not far from the National Theatre and a block from the Vltava River , which cuts through the city , collapsed the first floor 's ceiling , officials said . Windows in neighboring buildings were damaged . Officials do not believe anyone is trapped in the rubble , though fire officials will remain at the site for a while longer `` to be 100 % sure nobody is in there , '' Svoboda said . People who initially were unaccounted for were later found with minor injuries , he said . Of the 35 people injured , 30 were taken to hospitals , including two people who suffered serious injuries , officials with the city 's emergency services said . The city 's fire department , which is examining the area for possible gas leaks , said it would take two days to stabilize the site . Charles University canceled classes at an adjacent building for the rest of Monday . A surveyor employed by the city told reporters Monday that the building might not need to be demolished and that the damage appears to be reparable . Earlier , Czech news media gave conflicting reports of the building 's location , with an outlet reporting at one point that the blast happened at a FAMU building . FAMU dean Pavel Jech said that the blast happened near FAMU 's main building , known as Lazansky Palace , which was evacuated . `` Nobody in FAMU has suffered any injuries , '' Jech said . `` There will be no classes for the rest of the week at Lazansky Palace . Classes scheduled at other locations ... will continue as planned . Marianna Zapotilova was in an office in a nearby building when the blast happened . The office 's window was open , and the force of the blast `` pushed me away from my computer , '' she said . `` There was a lot of dust '' immediately after the explosion , Zapotilova said . `` People in the area were injured , mainly by broken glass from the windows ; they had their heads bandaged . '' CNN 's Sarah Balter contributed to this report .
`` 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 .