Surveillance footage and audio captured the helicopter traveling south before it "suddenly separated into three major sections," the NTSB said.

The National Transportation Safety Board has released its preliminary report on April's Hudson River helicopter crash that killed six people.The six-page report sheds new light on what exactly happened in the crash of the tour helicopter that killed a family of five from Spain,

Witnesses heard "loud bangs" last month from the doomed sightseeing helicopter just before it broke apart above the Hudson River and crashed, killing a family of five and the pilot, according to a preliminary report from the National Transportation Safety Board.