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A line of trucks waits for the Karni Crossing between Israel and the Gaza Strip to open, Monday, March 20, 2006. Israel briefly reopened the Karni crossing Monday to let humanitarian aid into the impoverished Gaza Strip, but closed it just minutes later, Palestinian security officials said. It was not clear when the crossing would reopen. The army said Karni was shut down following a security alert. (AP Photo/Khalil Hamra)