President Ali Abdullah Saleh of Yemen has agreed to step down under a 30-day transition plan aimed at ending violent unrest over his 32-year rule. Officials in the capital Sanaa confirmed the government had accepted the plan drawn up by Gulf Arab states. Mr Saleh will hand power to his vice-president one month after an agreement is signed with the opposition, in return for immunity from prosecution. At least 120 people have died during two months of protests. The US has welcomed the announcement; a statement from the White House urged all parties to "swiftly" implement a peaceful transfer of power. Opposition leader Yassin Noman was quoted by Reuters news agency as saying he welcomed news of the handover but would not take part in a proposed national unity government. The opposition have been insisting they will not accept immunity from prosecution for Mr Saleh and his family.