EU ministers will discuss emergency measures today that could extend border controls aimed at tackling the migration crisis.
European justice and interior ministers have gathered for an informal meeting in Amsterdam, amid concerns over the continued viability of the Schengen Agreement - which allows passport-free travel in parts of the EU.
Thousands of refugees and migrants have died in the Mediterranean during their attempts to reach Europe.
More than a million migrants and refugees crossed into Europe in 2015, according to the International Organisation for Migration (IOM).
The organisation estimates that some 31,000 migrants have reached Greece by sea so far this year, hoping to start new lives in Europe.
35 refugees died when a boat sank in the Aegean Sea in the early hours of Friday.
The passengers were told it would be so safe they would not need life jackets. It is reported that they paid nearly €2,500 per person for a place on the boat.
Irfan Masood tried to save a fellow passenger - but was forced to let go:
The migrant crisis was a major talking point at last week's World Economic Forum (WEF) in the Swiss ski resort of Davos.
The head of the International Monetary Fund, Christine Lagarde, suggested that the migration crisis has pushed Europe to a "make or break" point.
Over the weekend it was reported that the UK is considering taking thousands of unaccompanied Syrian refugee children from migrant camps in Europe.
