By Nadim Ladki BEIRUT (Reuters) – A U.N. team began an inquiry in Beirut on Friday into former Prime Minister Rafik al-Hariri’s assassination, which the Lebanese opposition blamed on Syria. Syrian troops in Mount Lebanon and northern parts of the country stayed put, a day after Damascus announced it was planning to pull back its troops toward the border in line with the Taif Accord that ended Lebanon’s 1975-90 civil war. The U.N. Security Council, angered by the Feb. 14 bombing that killed Hariri and 17 others, had asked Secretary-General Kofi Annan to report urgently on “the circumstances, causes and consequences of the assassination.”