A sightseeing helicopter tour over Manhattan turned into a devastating tragedy within minutes—an incident partially caught on video—that has now sparked serious questions and an international investigation.

The helicopter, which was carrying a Spanish family of five along with their pilot, crashed into the Hudson River on Thursday afternoon, leaving all six occupants dead.

Authorities identified the victims as Agustin Escobar, a senior executive at European automation firm Siemens; his wife, Merce Camprubi Montal; and their three children, ages 4, 5, and 11. The family, originally from Barcelona, was vacationing in New York at the time. The 36-year-old pilot was also killed, although officials have not yet released his name.

The fatal crash, which occurred near Lower Manhattan, prompted an immediate emergency response and launched a global inquiry into what led the flight to end so abruptly and fatally.