At least 3.9 million unauthorized migrants — and possibly as many as 4.8 million — lived in Europe in 2017 with half of them in
Germany and the
United Kingdom, according to a study published Wednesday.
The Pew Research Center said the number grew from 2014, when about 3-3.7 million resided in Europe, and peaked in 2015-16 during the refugee crisis when some 1.3 million people arrived, mostly from war-torn countries such as
Syria,
Iraq and Afghanistan.
Also, the
European Union and
Turkey signed a deal designed to keep millions of migrants in Turkey from coming to Europe, and many asylum seekers, especially Syrians, received asylum or residency rights in Germany and other European countries.