An international police and customs operation called "Balkan Bridge 2" wraps up today along all of Bulgaria's borders. Officials announced the results at a briefing at the Kapitan Andreevo border crossing.

Officers found 56kg of drugs hidden inside sofas. They also found 9 migrants hidden in secret compartments in vehicles, and detained 22 Syrian nationals. They seized untaxed cigarettes and ammunition too.

Police identified the leader of a migrant-smuggling network. They also seized two boats used to carry migrants.

The operation began last Monday, led by the UK's National Crime Agency, Bulgaria's Border Police and Customs Agency, with support from Europol and Frontex. Hundreds of officers from different countries took part.

The briefing was attended by the director of the Border Police, the management of the Customs Agency, and representatives of the UK's National Crime Agency and German customs.

Angel Zlatanov presented how the operation went and its results. He said trust between agencies is what lets so many officers from different countries work together.

"Thanks to everyone's efforts, we're keeping migrant pressure at extremely low levels," Zlatanov said. "Illegal immigration is low right now. We're the good example here." He said most migrants heading to Bulgaria set out from Afghanistan, Syria and Morocco.

This year's operation got much better results than last year's, said Stefan Bakalov, deputy director of the Customs Agency. He said the smuggling of firearms has been rising in recent months.

Updated (04.10, 12:58): Updated figures from the joint border police operation, reported by BTA, show officers found seven migrants from outside the EU during checks, not nine as first reported. The drugs seized came to more than 58kg, not 56kg. Officers also seized over 300,000 cigarettes without tax stamps, 58,680 bottles of e-cigarette liquid, more than 22,300 fake textile items, 9,000 perfumes, toiletries and cosmetics, 1,750 packs of medicine, and more than 1,130 gun parts and rounds of ammunition. The two boats were meant to smuggle migrants across the Channel from France to the UK. Agencies from the US, France, Austria and Italy took part in the operation, along with observers from Japan, Greece and Romania.