Many people are feared drowned after a boat carrying up to 400 mainly Somali migrants capsized in the Mediterranean off the coast of Egypt.
Hollywood star and UNHCR goodwill ambassador Angelina Jolie visits a makeshift camp in Greece and says the refugees were stuck in a "deteriorating humanitarian situation" and needed help.
Macedonia has said it will no longer let any migrants through its border with Greece, effectively blocking the Balkan route north.
More than 131,000 migrants and refugees reach Europe via the Mediterranean this year, more than the total number in the first half of 2015, the United Nations says.
More than 7,000 migrants have been stuck in worsening conditions on the Greece-Macedonia border at a camp designed to support just 1,500 people.
Facebook's Mark Zuckerberg says the social network needs to get better at cracking down on hate speech against migrants.
Police in Hungary say increasing numbers of migrants are breaching a razor wire fence built to stop them crossing the border from Serbia.
More than 10,000 migrant children may have disappeared after arriving in Europe over the past two years, the EU's police intelligence unit says.