UNITED NATIONS - A senior UN official called on Israel on Friday to curb extremist settlers following a report that a blaze earlier this week in a mosque in a Palestinian village on the occupied West Bank was probably the result of arson. There have been a number of attacks upon mosques in recent months, as well as violence against Palestinian property and individuals by extremist settlers, Special Coordinator for the Middle East Peace Process Robert Serry said, voicing deep concern at a fire service report that Tuesdays blaze in a mosque in Lubban al Sharqiya was probably started deliberately. I condemn these attacks. It is vital that the Israeli Government impose the rule of law and that those responsible for such crimes are brought to justice, he added in a statement. Extremists from either side must not be allowed to set the agenda and undermine the vital efforts to renew negotiations. Proximity talks, or indirect negotiations, between Israel and the Palestinians are due to begin shortly following a 16-month halt to meetings between the two sides after Israel launched a deadly offensive against Gaza at the end of 2008, killing over 1,300 Palestinians.