SOFIA, Bulgaria (AP) — Bulgarian customs officials say they have seized 191 kilograms (420 pounds) of heroin found in a truck entering Bulgaria from Turkey.

Officials valued the heroin at 6.3 million euros ($7.4 million).

The national customs agency said on Friday that the drugs were found in a Turkey-registered truck at a checkpoint on the Turkish border. It was carrying construction materials and was bound for Belgium.

Customs chief Georgi Kostov said the heroin was hidden in 95 factory-sealed bags.

The driver, a Turkish citizen, was detained and could face up to 15 years in jail, if convicted on drug trafficking charges.

Bulgarian army deploys 300 additional troops to martial law migrant border zone with Turkey https://t.co/tLolBfZPZA pic.twitter.com/opWAJZYLr1 — Breitbart London (@BreitbartLondon) April 11, 2016