Israel has said that it would co-operate with an international inquiry into the past nine weeks of violence in which at least 293 people have been killed. Dropping its earlier reluctance, the Israeli Government said that it would work with an investigating team led by Senator George Mitchell, the former chairman of the Stormont talks in Northern Ireland. Officials in Washington said that the Israeli decision followed pressure from President Clinton, who made a 45-minute phone call on Friday to the Israeli Prime Minister, Ehud Barak.