Prime Minister flew today from Algiers to Tripoli, for his second visit to the capital in 15 months.
He was due to meet Prime Minister Ali Zeidan and President Mohammed el-Megarif.
Mr Cameron staged a walk about in Martyrs' Square where he was mobbed by crowds, some shouting "welcome".
Mr Cameron visited a police training college and pledged to send more
police from Britain to help train Libyan police officers. British
servicemen are also training Libyan soldiers.