The European Union’s Frontex border guard agency is currently probing two allegations regarding illegal pushbacks of migrants in the Aegean Sea between Turkey and Greece, the Warsaw-based agency reported on Thursday. Allegations of this kind were taken extremely seriously, and two investigations regarding serious incidents had been initiated, Frontex said. The agency was reacting to a report carried by German public broadcasters NDR and WDR. It declined to provide further details as investigations were ongoing. In one instance, the broadcasters reported the existence of video material showing …