Yemen : 10 Yemeni militants came to Sinai two months before Rafah attack . The militants were smuggled into Sinai from Sudan among thousands of African migrants . ` ` We want to capture them in our raids , '' Egypt says . Egyptian and U.S. are concerned about the rise of terrorist cells in the Sinai peninsula .
Official : 10 Yemeni militants came to Egypt two months before Rafah attack . The militants were smuggled into Sinai from Sudan among groups of African migrants . `` We hope to capture them in our raids , '' official says . Israel and U.S. are concerned about the rise of terrorist cells in the Sinai peninsula .