Before the business jet crashed in Florida, the crew reported a sharp loss of altitude and malfunctions, the Associated Press reports. One of the pilots warned the controllers that the plane was descending at speeds of up to 20,000 feet per minute. All nine people on board were killed and several others were injured on the ground. Before the crash, pilots also reported ice, turbulence and precipitation. The cause of the crash is being determined by the US National Transportation Safety Board (NTSB).