At least three people were hurt in a clash between asylum-seekers in a town on the Greek island of Samos, police sources said Tuesday.
Greece said Monday it wanted to start sending back thousands of migrants to Turkey, a day after a deadly fire sparked riots at an overcrowded camp on the island of Lesbos.
Germany, France, Italy and Malta agreed Monday on a redistribution mechanism for migrants rescued in the Central Mediterranean, but the proposal still needs wider European Union agreement.
Italy on Saturday agreed to allow rescue ship Ocean Viking to disembark 82 migrants on southern islands Lampedusa after six days at sea following a European deal to distribute them.
British authorities said they intercepted 86 migrants crossing the Channel from France on small boats on Tuesday, thought to be one of the largest number of apprehensions in a single day.
Greece on Monday began moving asylum seekers from Lesbos in the Aegean islands to the mainland to reduce the pressure on overcrowded camps.
Italian police on Monday seized a German migrant rescue ship that had been stranded at sea for a week with more than 100 migrants aboard
More than 150 migrants forced their way into Spain's overseas territory of Ceuta on Friday, hours after 540 people alighted in Greece as pressure on southern European states continues
The rescue ship Ocean Viking completed a 23-day mission this week, plucking 356 migrants, mainly African, from Libya's perilous waters, after a major stand-off with European nations.
About 40 people are feared dead or missing after the latest wreck of a boat carrying migrants bound for Europe off the coast of Libya
The 356 migrants stranded on board the Ocean Viking charity rescue ship will be taken to Malta and then all relocated to other European countries, the Maltese government announced on Friday.