A helicopter carrying five people crashed into New York City’s East River, killing one passenger and injuring three others and the pilot. The three surviving passengers have been hospitalized—at least one with critical injuries—and the pilot was treated at the scene. Two of the passengers, including the one who died, were from Britain and lived in Portugal. The other two were from Australia, and though no names have been released yet, all passengers apparently knew the pilot. The chopper took off from the 34th Street helipad but appeared to experience trouble and attempt to return. According to a witness, it spun several times, fell into the river, and sank in seconds. It is not yet clear what caused the helicopter to go down, but the National Transportation Safety Board is investigating the crash.