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Cash-strapped Greece is currently facing pressure to get acceptance from eurozone bosses over its plans for the country's financial reform.

The rising tensions between Greece and the eurozone came as Panos Kammenos, the Greek defence minister, warned that Europe will be hit with migrants that could include "some jihadists of the Islamic State" if Greece is forced out of the euro.

He said: "If they deal a blow to Greece, then they should know the the migrants will get papers to go to Berlin.

"If Europe leaves us in the crisis, we will flood it with migrants, and it will be even worse for Berlin if in that wave of millions of economic migrants there will be some jihadists of the Islamic State too.”

His comments came shortly after Nikos Kotzias, the Greek foreign minister, warned that "there will be tens of millions of immigrants and thousands of jihadists” if bailout negotiations fail.

In retaliation to Mr Kammenos' comments, the spokeswoman for EU Migration Commissioner Dimitris Avramopoulos assured she had spoken to Greek authorities and had "received assurances from the Ministry of Interior that no measures to open up detention centres have been taken."