SOFIA, Nov. 18 (Xinhua) -- Bulgarian customs officers have seized 93.6 kg of heroin at the Danube Bridge checkpoint near Ruse at the border with Romania, authorities said Monday.

The illicit drug, split into 184 packets, was discovered on Sunday morning in a secret compartment under the floor of a Bulgarian truck when it attempted to leave Bulgaria, the country's Interior Ministry, Prosecutor's Office and National Customs Agency said in a joint statement.

Authorities estimated the value of the heroin on the black market would exceed 2.03 million U.S. dollars.

Bulgaria, a key transit route for drugs smuggled from Asia to Europe, seized nearly 987 kg of heroin in 2018, official data showed.