Poland starts building wall through protected forest at Belarus border

Barrier will stretch for almost half the length of the border and cost 10 times migration department's budget

Poland has started building a wall along its frontier with Belarus aimed at preventing asylum seekers from entering the country, which cuts through a protected forest and Unesco world heritage site.

The Polish border guard said the barrier would measure 186km (115 miles), almost half the length of the border shared by the two countries, reach up to 5.5 metres (18ft) and cost 353m (293m). It will be equipped with motion detectors and thermal cameras.