"Egypt is building a 13-foot high concrete and rock wall interspersed with watch towers along its narrow boundary with the Gaza Strip to prevent Hamas militants from breaching the border, an official said Thursday. The wall, set back nearly 35 feet from an existing metal barrier, has guard towers every 100 yards. With it, Egypt hopes to prevent any future breaches like one in January when Palestinians broke through to escape an Israeli blockade, a security official said on customary condition of anonymity." (thanks ls)