NEW YORK — Police and fire department divers were searching Friday for the main and rear rotors of a sightseeing helicopter that broke apart in midair and crashed into the Hudson River between New York City and New Jersey, killing all six people aboard including a family of five from Spain.

Those parts, along with the helicopter’s transmission, the roof and tail structures have not been found since the crash Thursday afternoon, Jennifer Homendy, chair of the National Transportation Safety Board, told reporters at a briefing in Jersey City, New Jersey.

Officials also identified the pilot as 36-year-old Seankese Johnson.

Hemendy said the board would not speculate on the cause of the crash so early in the investigation.

“We are very factual and we will provide that in due course,” she said.

Visibility was low in the murky river and divers were using sonar to hunt for the missing pieces. The pilot and passenger cabin of the aircraft was pulled from the river Thursday. The victims from Spain included a Siemens executive, his wife and their three children.

— The Associated Press