Officials said there may have been “some breakup” of the Learjet 60 before it crashed Sunday afternoon in Palm Beach County , Florida, killing all nine people on board.

Among those killed in the crash where two children, ages 4 and 2, and their parents, the families of the victims said in a joint statement Monday.

For Adam Robinson and Helen Sharp, their children Emma, 4, and Charlie, 2, were “the light of their lives,” the families said.

The aircraft had departed from Austin-Bergstrom International Airport in Texas and was headed to North Eleuthera, Bahamas, the National Transportation Safety Board said at a news conference Monday.

The plane crashed around 12:50 p.m. Sunday near the residential neighborhood of Cresthaven in Greenacres, about 7 miles southwest of West Palm Beach.

The cause remains under investigation.

“We do have some evidence that there was some breakup of the aircraft before impact.…