MOSCOW (AP) — Russia's Defense Ministry said a rocket engine exploded during a test Thursday, killing two people and injuring four others. Local officials reported a slight increase in radiation levels in a nearby city. The ministry said the explosion occurred at a military shooting range in Nyonoksa in the northwestern Arkhangelsk region, causing a fire. It said six servicemen and civilian engineers were injured, and two of them later died of their injuries. Some Russian news reports cited unidentified sources who said up to 15 people were injured. Nyonoksa hosts a navy facility that serves as a base for...