The retired Los Angeles Lakers star Kobe Bryant, 41, and his daughter Gianna died in a helicopter crash near Calabasas, Calif., on Sunday.
Bryant was among the passengers traveling onboard the helicopter. Nine people died in the crash, including the pilot, said Alex Villanueva, the Los Angeles County sheriff, during a news conference.
The National Transportation Safety Board said it sent a team to California on Sunday evening.
Daryl Osby, the Los Angeles County fire chief, said the crash site was difficult to access and that firefighters had to hike to the area.
It was not immediately clear how many passengers the helicopter was approved to transport, and fire officials said it was not immediately clear whether the helicopter was overloaded.
The N.B.A. sent a confirmation of Bryant’s and Gianna’s deaths to all teams and league employees Sunday afternoon, according to two people familiar with the document.
The other victims of the crash included John Altobelli, a longtime baseball coach at Orange Coast College, a junior college in Costa Mesa. Calif., as well as Altobelli’s wife, Keri, and daughter Alyssa, university officials said.