A strong explosion rocked the centre of Prague on Monday morning, leaving dozens of people injured. The blast, which the authorities say may have been caused by a gas leak, severely damaged a building on the edge of Prague’s Old Town. Rescue workers are now searching the rubble for any people who might be trapped inside. The explosion occurred shortly before 10 a.m. local time inside a building in Divadelní Street in central Prague, near the National Theatre and a block away from the embankment of the Vltava. The National Theatre is the last the great 18th century theatres remaining in Europe and was an important venue for Mozart and others. The blast shattered windows in many buildings in the area, and the shockwave was felt as far as the other bank of the river where people said they felt the tremor.