Israel seizes Gaza's vital Rafah crossing

Israeli troops have seized control of Gaza?s vital Rafah border crossing in what the White House described as a limited operation. Fears are mounting of a full-scale invasion of the southern city and cease-fire talks with Hamas remain on a knife?s edge. The U.N. warned of a potential collapse of the flow of aid to Palestinians from the closure of Rafah and the other main crossing into Gaza at a time when officials say the northern part of the enclave is already experiencing ?full-blown famine.?