Germany has announced plans to tighten control at all of its land borders as part of a crackdown on migration, placing restrictions on a wide area of free movement known as the Schengen Zone.

Germany reintroduced temporary controls on its western and northern borders on Monday as part of efforts to combat irregular migration and cross-border crime, the interior ministry said.

Poland has sharply criticized the German government's plans to introduce temporary controls at all of Germany's land border crossings in a bid to combat irregular migration. "This approach is unacceptable,