SOFIA, March 11 (Xinhua) -- Bulgarian customs officers found about 163kg of heroin hidden in a truck bound for Austria at a checkpoint along the border with Serbia, the customs office said on Sunday.

    The owner of the truck, a 42-year-old Turkish citizen, had been arrested, the customs office said in a statement.

    Authorities put the value of the seizure at 20 million U.S. dollars, said to be the second largest heroin haul at a Bulgarian border checkpoint in the past five years.

    Bulgaria, which straddles one of the main drug-trafficking routes between Europe and southwest Asia, seized 8.4 tons of drugs last year.