Tunisia’s prime minister urged European countries on Wednesday to increase financial assistance to his country and others to help tackle the flow of migrants from sub-Saharan Africa. Tunisia has faced protests by local residents and extra financial costs over migrants arriving from other countries in the hope of travelling on to Europe by sea, risking perilous journeys on what in many cases are dilapidated boats. Thousands of migrants are now concentrated in southern Tunisian towns such as Amra and Jbeniana, many of them fleeing poverty and conflict in Africa and the Middle East in the hope of…