A Palestinian smuggler climbing a tunnel which links the southern Gaza strip town of Rafah with Egypt in 2009 (AFP/File/Said Khatib)
The network has weathered Israeli air strikes and Egyptian attempts to flood tunnels with water and gas, but there are accusations that they are used to smuggle weapons into the Gaza Strip run by Islamic Hamas militants.
Citing national security, Egypt is now building an underground iron wall in a new bid to tighten its porous Sinai border with the restive Palestinian territory.
Cairo -- which states support for Palestinians and has long mediated between both Israel and Hamas and among Palestinian factions -- has only implicitly admitted constructing the iron barrier and has provided no details on its size.
Media reports, however, said it would be 30 meters (100 feet) deep and 10 kilometers (six miles) long.
But Duguid stressed Washington also supported "greater access for humanitarian supplies to get into Gaza.
"There are established channels for that, and those established channels should not be hindered by Hamas or any party in Gaza."
Egypt at the weekend banned aid convoys bound for the Gaza Strip from traveling across Egyptian territory after activists clashed with police.
Foreign Minister Ahmed Abul Gheit told the government newspaper Al-Ahram that members of one convoy led by British MP George Galloway committed "criminal" acts on Egyptian soil on their way to Gaza.
"Egypt will no longer allow convoys, regardless of their origin or who is organizing them, from crossing its territory," Abul Gheit said.
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Citing national security, Egypt is now building an underground iron wall in a new bid to tighten its porous Sinai border with the restive Palestinian territory.
Cairo -- which states support for Palestinians and has long mediated between both Israel and Hamas and among Palestinian factions -- has only implicitly admitted constructing the iron barrier and has provided no details on its size.
Media reports, however, said it would be 30 meters (100 feet) deep and 10 kilometers (six miles) long.
But Duguid stressed Washington also supported "greater access for humanitarian supplies to get into Gaza.
"There are established channels for that, and those established channels should not be hindered by Hamas or any party in Gaza."
Egypt at the weekend banned aid convoys bound for the Gaza Strip from traveling across Egyptian territory after activists clashed with police.
Foreign Minister Ahmed Abul Gheit told the government newspaper Al-Ahram that members of one convoy led by British MP George Galloway committed "criminal" acts on Egyptian soil on their way to Gaza.
"Egypt will no longer allow convoys, regardless of their origin or who is organizing them, from crossing its territory," Abul Gheit said.
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