MADRID, Dec 19 (SPA) - Two sailors died on board a Spanish navy ship at the northwestern port of El Ferrol on Monday after what appeared to be an accidental explosion, the Europa Press reported. The agency reported that the explosion was thought to have happened when the ship's engines were being started. It quoted Defense Ministry sources as saying preliminary investigations suggested it was an accident. --SPA1247 Local Time 0947 GMT www.spa.gov.sa/312926