Up to 30 migrants are feared dead after a boat capsized off the Libyan coast while some 50 have been rescued by EU vessels from the sea.
Five times more attacks were carried out on migrant hostels in Germany last year than in 2014, German police say.
Women and children at a migrant camp outside the French port city of Calais are to be given heated tents by the end of the week, officials say.
Thousands of migrants are stranded at borders in the Balkans, in cold and wet conditions, as their path to western Europe is blocked.
Hungary has closed its border with Croatia in an effort to stem the flow of migrants through the country en route to western Europe.
Plans to speed up the deportation of failed asylum seekers are to be discussed at a meeting of EU ministers in Luxembourg.
Seventeen migrants attempting to reach Greece by boat from Turkey drown after their boat sank off the Turkish coast.
European Union leaders pledge another €1bn (£700m, $1.1bn) to help UN agencies support Syrian refugees in the Middle East, as part of renewed efforts to tackle the EU's migrant crisis.