European Union leaders have pledged another €1bn to help UN agencies support Syrian refugees in the Middle East, as part of renewed efforts to tackle the EU's migrant crisis.<br />More help will be extended to Syria's neighbours, where millions have fled since the country's conflict began.<br />The leaders also agreed on strengthening EU external borders.<br />About half a million migrants have arrived in Europe this year, exposing deep divisions within the EU.<br />The emergency summit in Brussels got under way amid a bitter row over the relocation of 120,000 migrants.
