A Palestinian tunnel digger, wearing a mask to conceal his identity, removes sand in a bucket from a tunnel underground in Rafah, in the southern Gaza Strip, on the border with Egypt, in this file photo taken late Wednesday, Aug. 1, 2007. Israel is concerned that Hamas is using subterranean tunnels under the Egypt-Gaza border to amass ammunition and explosives to brace for an intensified round of fighting. At the end of October, the Israeli military said 70 tons of explosives have been smuggled into Gaza through the tunnels since the Gaza takeover. AP Photo logo AP Photo 30 months ago

A Palestinian tunnel digger, wearing a mask to conceal his identity, removes sand in a bucket from a tunnel underground in Rafah, in the southern Gaza Strip, on the border with Egypt, in this file photo taken late Wednesday, Aug. 1, 2007. Israel is concerned that Hamas is using subterranean tunnels under the Egypt-Gaza border to amass ammunition and explosives to brace for an intensified round of fighting. At the end of October, the Israeli military said 70 tons of explosives have been smuggled into Gaza through the tunnels since the Gaza takeover.