Tragedy has struck on the blocked Greek-Macedonian border, with three migrants dying attempting to cross. br br Macedonian police say two men and a woman have drowned while trying to cross a river swollen by heavy rain. br br The drownings happened near the Macedonian town of Gevgelija.br br The tragedy comes amid reports that eight people are missing after a migrants boat sank off the Greece island of Kos.br br Migrants are still arriving in Greece despite the closure of the so-called Balkans route, and a bottleneck of thousands of people. br br A complex draft agreement between the EU and Turkey over how to stem the flow of migrants will be debated at a summit in Brussels this week.br br However, there are obstacles to overcome, with a question mark over the legality of the plan and the practical aspects on the ground.