Australian Prime Minister Tony Abbott visits the Endeavour Hills police station in Melbourne, Australia, on Friday. Abbott has declined to refute claims that his government paid smugglers to turn back would-be asylum seekers. Tracey Nearmy/EPA/Landov hide caption

toggle caption Tracey Nearmy/EPA/Landov

Alleged Islamic State militants stand next to an ISIS flag atop a hill in the Syrian town of Ain al-Arab, called Kobane by the Kurds, as seen from the Turkish-Syrian border in Suruc, Turkey, on Monday. Aris Messinis/AFP/Getty Images hide caption

toggle caption Aris Messinis/AFP/Getty Images