NASHVILLE, Tenn. — Authorities said Wednesday that they have identified the remains of 14 of the 16 people killed last week in a massive blast at a Tennessee explosives plant , where it's possible still more dangerous materials need to be disarmed and weeks of work could be ahead to try to pinpoint what sparked the explosion. At a news conference, Humphreys County Sheriff Chris Davis said the Tennessee Bureau of Investigation positively identified 14 of the victims in the explosion Friday at