A U.S. official reportedly told CNN Thursday that the Russian plane crash over the Sinai Peninsula in Egypt over the weekend "was most likely caused" by a bomb planted on the passenger plane by ISIS or an ISIS affiliate. The official said that U.S. intelligence has yet to reach a formal consensus on the cause of the crash that left all 224 people aboard dead, but that "the analysis is pointing toward the cause being a bomb." "There is a definite feeling it was an explosive device planted in luggage or somewhere on the plane," the official told CNN. The revelation comes shortly after British Prime Minister David Cameron suspended all flights from the Egyptian resort city of Sharm el Sheikh to Britain, citing concerns about explosive devices.