The Swedish government on Wednesday said it would temporarily reinstate border checks to deal with an unprecedented influx of migrants, making it the latest country in Europe's passport-free Schengen zone to tighten its borders over the crisis.

"A record number of refugees are arriving in Sweden. The migration office is under strong pressure... and the police believe there is a threat against public order," Interior Minister Anders Ygeman said.

"So we will re-establish controls at our national borders tomorrow (Thursday) from 12:00 pm (1100 GMT)" for a 10-day period, he added.