UN investigators have grilled the former Syrian intelligence chief in Lebanon, Rustom Ghazaleh, and his deputy over former Lebanese premier Rafiq Haririâs murder, Al-Hayat newspaper reported on Tuesday. Ghazaleh and Jameh Jameh were heard Monday behind closed doors at UN offices in Vienna, where three other Syrian witnesses are also due to be probed by the UN team, the London-based Arabic daily said. It said the head of the Palestinian affairs department in the Syrian intelligence services, Abdelkarim Abbas, communications chief Zaher Yussef, and retired Colonel Samih al-Kashaani would testify on Wednesday. Mondayâs questioning focused on âdetermining the nature of the duties of the Syrian officersâ in Lebanon before Hariri was murdered in a massive bomb blast on February 14 that also killed 20 other people, Al-Hayat said, quoting unnamed sources. The UN investigators âreferred to recorded statements of phone conversations that took place between (Ghazaleh) and Lebanese political figuresâ, the sources told Al-Hayat. They likewise tried to determine any links between the Syrian officers and some suspects in the case who have said they âcontributed directly or indirectly in provoking or planning the assassinationâ, it said.