NTSB details break-up of sightseeing helicopter that crashed into the Hudson River, killing six.

The National Transportation Safety Board (NTSB) has released photos and details about a recent helicopter crash in the Hudson River, which killed six people. The Bell 206L-4 helicopter, carrying a family of five and a pilot, broke apart mid-air after reaching 675 feet, with witnesses hearing loud bangs before it descended into the river. The NTSB's investigation continues, with no cause yet determined, and a final report is expected in about a year.