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VILNIUS (Reuters) - Tobacco smugglers are using river iceflows and GPS technology to transport their goods into Lithuania, where an estimated one in every six cigarettes smoked in 2016 was illegally imported.

The Baltic country’s border guard said on Friday it had found thousands of packets of cigarettes attached beneath blocks of ice on the river Neris, which runs into Lithuania from Belarus, since the ice began flowing two weeks ago.

Around 1,000 packs were found last week and another 1,500 packs on Friday. The iceblocks carried GPS trackers to aid retrieval.

“This is the first time we find cigarettes underneath the ice. However, smugglers continuously attempt to use that stretch of the river,” border guard spokesman Rokas Pukinskas told Reuters. “The imagination of these people knows no limits.”

The cigarettes, which are about four times more expensive in Lithuania than in Belarus, were worth an estimated 8,000 euros, Pukinskas said.

KPMG came up with the one in six figure for smuggled cigarettes in a research report last year. That was the highest ratio in the European Union after Latvia, Greece and Ireland, the auditing firm said.

Most come from Belarus, where taxes on tobacco are far lower than in Lithuania, and some are then sold on for even larger profits in countries such as Britain and Ireland, KPMG said.

The Lithuanian government has said it lost 50 million euros in unpaid taxes in 2015 alone due to tobacco smuggling.