Obama, Cameron say bomb may have caused Egypt plane crash

Russian Emergency Minister Vladimir Puchkov (4th L) visiting the crash site of a A321 Russian airliner in Wadi al-Zolomat, a mountainous area of Egypt's Sinai Peninsula. Russian airline Kogalymavia's flight 9268 crashed en route from Sharm el-Sheikh to Saint Petersburg on October 31, killing all 224 people on board. (Photo: AFP)

US President Barack Obama and British Prime Minister David Cameron raised the possibility Thursday that a bomb brought down a Russian plane that crashed over Egypt's Sinai Peninsula, undermining efforts by Cairo and Moscow to downplay the suggestion of an attack.

With concerns over security mounting, a number of European airlines readied to bring home thousands of tourists from the Red Sea resort of Sharm el-Sheikh, where the ill-fated plane departed from last Saturday.