The investigation into a deadly business jet crash in South Florida is focusing on evidence that the aircraft may have begun breaking apart while still airborne, raising questions about what happened during its final moments.

All nine people aboard the aircraft were killed when it crashed into a residential neighborhood. Evidence gathered at the scene has prompted federal investigators to examine the possibility of a structural failure before the jet struck the ground and caught fire.

Tom Chapman, an investigator with the National Transportation Safety Board, said the material recovered from the crash site indicates that the aircraft may have suffered a serious structural problem in midair. However, the precise sequence of events and the underlying cause have yet to be established.

Information about the flight's final communications has added another element to the investigation. The pilot reportedly told authorities that the aircraft was descending at an extremely high speed shortly before the crash, a detail investigators will need to assess alongside the physical evidence.

The human consequences of the incident have extended beyond the nine victims. Among those killed was a family traveling with two young children, while residents of the neighborhood have faced disruption as authorities continue examining the wreckage and the surrounding area.

For people living near the crash site, the investigation has also meant uncertainty about when they will be able to return home. Temporary shelter arrangements have been established for those displaced by the incident while officials carry out their work.

The investigation remains ongoing, and determining whether the aircraft experienced a structural failure, as well as identifying the factors that may have contributed to it, will be central to establishing the cause of the tragedy.