President of the European Council Donald Tusk has confirmed all EU leaders have reached an agreement with Turkey's prime minister to curb the migration crisis.
The new arrangements could come into force as soon as Sunday after a revised deal was reached between Turkish PM Ahmet Davutoglu and European Council president Donald Tusk in Brussels.
The EU will significantly toughen its borders against migrants trying to get to Europe under a new deal agreed by leaders today.
Thousands of people arriving by boat the Greek islands will be sent back to Turkey from Sunday.
Video report by ITV News deputy political editor Chris Ship.
Donald Tusk, the president of the European Council, hailed the deal after complex negotiations, but warned it was no "silver bullet".
"The reality is more complex," he added.
The agreement involves closing the EU border on March 20 and sending back migrants who arrive in Greece after that date to Turkey.
Cameron asks EU leaders to back deployment of more international patrol ships close to Libyan coast in bid to deter migrant smugglers.
David Cameron will tell his European colleagues that the migration route from Libya to southern Italy is about to begin once more.