http://www.belta.by/president/view/v...v-238543-2017/
This article reports that Lukashenko claims that they found a number of militants (no idea how otherwise translate term "боевик", the only other word that comes to mind is terrorist/insurgent). They were allegedly preparing an armed provocation (context - Zapad-2017 exercises would be conducted in Belorussia, on 20th there was an attempt to rush the border guards in Ukraine by armed men on a jeep).
Allegedly those militants received training in various camps, located in Belorussia as well as other countries - Ukraine, Poland, Lithuania. Allegedly they were funded through Poland and Lithuania.
p.s.
http://www.bns.lt/topic/1912/news/52283903/
Lithuania denies those allegations.