Obama, Cameron say bomb may have caused Egypt plane crash

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. "I think there is a possi