Israel has closed its crossings with Gaza again because of Palestinian rocket fire at Israel, just a day after allowing vital humanitarian supplies in. The Israeli military says Palestinian militants fired a rocket at Israel on Monday and another on Tuesday, and the crossings were closed on Tuesday. Even though they were opened to allow 42 truckloads of supplies in on Monday, foreign correspondents were not allowed in. The ban on reporters has been in effect for more than two weeks. In Washington, visiting Prime Minister Ehud Olmert was asked about the ban. He said, "The reason the passages are closed is completely related to security matters ... we didn't want to take responsibility for the safety of journalists passing through."