OSLO (AFP) - All Oslo schools closed Thursday, sending students home or to new locations, after it was discovered faulty fire extinguishers liable to explode may have been installed across the capital, the city said. The compressed carbon dioxide extinguishers installed in Oslo schools between 2006 and 2011 may have a production fault ... and can explode on contact, the municipality said in a statement. To be safe, the education administration ... has decided to suspend and/or reorganise classes today, it added.