The U.S. Coast Guard says it will help investigate a cruise ship fire that killed one crew member and two contractors in the eastern Caribbean island of St. Lucia. Officials said Friday they are sending four marine safety professionals to help with the probe by the Marshall Islands, where the ship is registered. Officials with the U.S. National Transportation Safety Board also are helping, AP reported. The fire began Thursday in the engine room of the Oceania Insignia while it was docked at St. Lucia. The ship was on a 10-day cruise through the Caribbean and was scheduled to arrive in Miami on Wednesday. The 656 passengers aboard the Insignia were evacuated safely and the remainder of the cruise was cancelled. Passengers were flown back to Miami late Thursday and on Friday.