Ankara, April 10, SPA -- A Turkish military helicopter onMonday exploded in mid-air before crashing into the roof ofa factory in northwestern Turkey, killing four soldiersaboard and injuring two factory workers, private CNN-Turkand NTV televisions reported. The helicopter crashed during a military exercise near thetown of Uzunciftlik in Kocaeli province, east of Istanbul,Gov. Erdal Ata said. Witnesses said the helicopter exploded in mid-air beforeit crashed into the factory, reports said. Televisionfootage showed wreckage scattered in an area close to thefactory. The cause of the accident was not immediately clear. --SPA 13 08 Local Time 10 08 GMT www.spa.gov.sa/352528