ISRAELI human rights group B'Tselem has said the West Bank is facing grave water shortages largely because of Israel's "discriminatory" policies, BBC reported on Tuesday. The group criticised the distribution of joint water resources and limits placed by Israel on the Palestinian Authority's ability to drill new wells. "It will have serious repercussions on the economy and health," B'Tselem said. West Bank per capita water use is about 66 litres a day - just two-thirds of the recommended international minimum. The accumulated effects of a series of dry years would make matters worse in the months to come, the group added. Per capita water consumption by Israeli settlers in the West Bank is 3.5 times that of Palestinians, B'Tselem said. In some parts of the northern West Bank, a largely agricultural area, consumption is far below the overall average, B'Tselem said. "The chronic water shortage results in large part from Israel's discriminatory policy in distributing the joint water resources in the West Bank and the limits it places on the Palestinian Authority's ability to drill new wells," its statement said. AFP adds: Israel has barred a UN human rights committee from visiting the Palestinian areas on a fact-finding mission, the leader of the group said on Tuesday. "Israeli authorities did not allow us to visit the Palestinian territories," said Prasad Kariyawasam, head of the UN panel, adding that "no reasons were given by Israel because they do not recognise our mandate." Kariyawasam told a news conference in the Jordanian capital Amman that despite the ban by the Jewish state, the committee has interviewed Palestinians from the Gaza Strip, the occupied West Bank and East Jerusalem. The three-member panel, which has already visited Egypt, warned against "the deteriorating human rights and humanitarian situation in the occupied Palestinian territory, the grave situation in the Gaza strip, the impact of the separation wall on the human rights of Palestinian people, and the continuing settlements policy," according to Kariyawasam. Meanwhile, Israel again sealed off Gaza Strip on Tuesday in what it says retaliation for a rocket attack the previous day in breach of a truce in and around the impoverished Palestinian enclave. Military authorities closed the three border crossing points that had been used mainly to deliver humanitarian supplies to Gaza since Israel imposed a blockade after the June 2007 bloody takeover by the Islamist Hamas movement. It wasn't immediately clear when border crossings would reopen. "We'll review the situation at the end of the day and then take a decision," said Israeli military spokesman Peter Lerner. In the latest incident on Tuesday, a Palestinian woman, Aisha Ataya, 35, was shot in the foot near the border east of the southern town of Khan Yunis, according to Muawiya Hassanein, the head of Gaza emergency services. Witnesses said the woman was hit when Israeli troops posted along the border opened fire on a group of farmers.