Syria agreed yesterday with chief UN investigator Detlev Mehlis on the procedures for questioning Syrian witnesses in the probe into the killing of former Lebanese Prime Minister Rafik Al-Hariri. âAn agreement has been reached on the procedures and arrangements for hearing Syrian witnesses,â a Syrian official said after a meeting between Mehlis and a Syrian Foreign Ministry legal adviser, Riad Al-Daoudi. âMr. Mehlis will leave Syria later today and return toward the end of next week,â the source said without elaboration. Mehlis, probing the February assassination of Hariri in Beirut, arrived in Syria earlier in the day, starting a sensitive phase of the investigation which some Lebanese media say could implicate some Syrians.Damascus denies Lebanese allegations of Syrian links to the killing. It agreed to the visit by the German prosecutor after international accusations that it was not cooperating with the probe, which began in mid-June. A Syrian source close to the talks in Damascus said Mehlis wanted to interview at least eight Syrian officials, including top officers, who were serving in Lebanon at the time of the murder, and other senior figures. The source said the Syrian authorities might ask for judges from Saudi Arabia and Egypt to examine evidence that showed the interviews were necessary to the investigation, and might ask them to attend the questioning of witnesses in Syria.