Several hundred Bulgarian nationalists have blocked the three main checkpoints at the Bulgarian-Turkish border for a few hours Tuesday to prevent what they called "electoral tourism" by Bulgarian citizens living permanently in Turkey.

Bulgaria criticized Turkey, saying its officials were interfering in Bulgaria's internal affairs by calling on people to vote for a particular party.

Some 10 percent of the 7.2 million Bulgarians are of Turkish origin. More than 300,000 have settled permanently in neighboring Turkey, but still hold a Bulgarian passport and are eligible to vote in Bulgaria.

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