Bulgaria is facing a backlash from human rights groups after building a 30km-long, razor-wire fence along its southern border in an effort to block immigrants coming in from Syria via Turkey.

The 3m-high fence, which has taken a week to build and was completed on Thursday, has already reportedly brought the number of illegal arrivals down to 300 per month compared with 2,000 people each month this time last year.

Bulgaria was caught unprepared by a surge of 11,600 Syrian, Turkish and Afghan refugees last year following the crisis in Syria - 10 times the annual number of asylum seekers to the country before the civil war.

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