Bulgaria arrests 23 in crackdown on border corruption. Twenty-three customs officers and businessmen have been arrested in a probe into corruption at a major checkpoint on Bulgaria's border with Greece, prosecutors said on Wednesday. The investigation focuses on alleged kickbacks by Bulgarian transport firms to let trucks pass through the Kulata border point without a check. Police carried out 83 raids on the homes of customs offices and transport firms in Kulata and Sofia, and seized 63 000 leva (€32 000) in cash.