One person was killed and four injured in an explosion at a British-owned ammunition factory near Rome .
British defense company Chemring Group PLC purchased Simmel Difesa in March for EUR77 million (US$108 million).
"Chemring is launching an immediate investigation into the nature of this incident," Chemring spokesman Rupert Pittman said by telephone.
On its Web site, Simmel Difesa says it has a 200-strong work force and produces 300,000 rounds of medium and large caliber ammunition a year.
A carabinieri official, who declined to be identified, said one person was killed by the blast and 14 injured, including one seriously.