Fifteen militants were killed in the Sinai Peninsula by rocket fire, Egyptian state TV reported on Tuesday, after witnesses said army helicopters had attacked militant strongholds in the area.The state-run Nile TV gave no further details in a brief report. The army helicopters had targeted two villages south of Sheikh Zuweid, a town near the border with Israel and the Hamas-run Gaza Strip.An army source said a ground operation was under way with air cover, but declined to give further details because it was still continuing.
