The story

Three families with young children were heading to a ski vacation together when their plane crashed into a cemetery in Montana, loved ones of the victims said Monday.

Federal investigators said that with no flight data recorder or cockpit voice recorder on the plane and no survivors, an investigation into what caused the crash could last months. "This is going to take a while," National Transportation Safety Board Acting Chairman Mark Rosenker said at a news conference Monday.

Investigators are looking into whether the single-engine plane was overloaded, what role weather may have played in the accident and what made the pilot decide to divert to Butte, he said. He urged reporters not to "jump to conclusions" about the crash. Read full article »

CNN's Auggie Martin, Dan Simon, Jim Spellman, Mike Ahlers and Irving Last contributed to this report.

All About MontanaFederal Aviation AdministrationU.S. National Transportation Safety Board

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