One person was killed and 13 others were injured when anexplosion took place in an apartment building, Austrian officials said Saturday.German news agency DPA reported today that Austrian security were stillinvestigating the cause of the explosion. Rescue teams are currently searching for a50 year-old who remains missing. The building was partly destroyed by theexplosion. The top two floors of the four-storey building collapsed.The man killed was a 19 year-old. He died on his way to the hospital. The othersinjured are not in a critical condition.