Wreckage from the helicopter that crashed last month and killed Kobe Bryant, his daughter and seven others did not show any evidence of engine failure, the National Transportation Safety Board said Friday.

Bryant, his 13-year-old daughter Gianna, and the others died in the Jan. 26 crash in Calabasas, California. The group was flying to a girls basketball tournament at his Mamba Sports Academy. Gianna’s team was coached by Bryant and was playing in the tournament.

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The NTSB is investigating the accident, including any role heavy fog played, and a final report isn’t expected for at least a year.

Investigators believe that since a tree branch at the crash site was cut, it appears the engines were working and rotors turning at the time of impact.

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