On July 26, 2023, a group of approximately 20 migrants illegally crossed from Belarus into Lithuania through an underground tunnel near the Kapčiamesta border post in the Lazdijai district. Lithuanian border guards had detected tunnel digging activity beneath the state border and set a trap. Four border guards arrested the first migrants exiting the tunnel and handcuffed them. Subsequently, about 20 more migrants emerged and attacked the border guards, forcing them to retreat. The migrants, including those handcuffed, then fled back into Belarusian territory. No injuries were reported among border guards or migrants. The Lithuanian State Border Guard Service had not publicly disclosed the attack until August 5, 2023, citing ongoing pretrial investigation led by the Alytus District Prosecutor's Office. The tunnel was approximately 11 meters long and located about 9.5 meters inside Lithuanian territory, beneath the patrol road, with no tunnel exits on the Lithuanian side. Lithuanian Prime Minister Mindaugas Sinkevičius criticized the delay in public disclosure and ordered an investigation into the late information release and conduct of border guards. Following investigation activities, the tunnel was filled in. The incident represents an illegal border crossing attempt using subterranean means and a physical assault on state border personnel.

On July 26, 2023, a group of approximately 20 migrants illegally crossed from Belarus into Lithuania through an underground tunnel near the Kapčiamesta border post in the Lazdijai district. Lithuanian border guards had detected tunnel digging activity beneath the state border and set a trap. Four border guards arrested the first migrants exiting the tunnel and handcuffed them. Subsequently, about 20 more migrants emerged and attacked the border guards, forcing them to retreat. The migrants, including those handcuffed, then fled back into Belarusian territory. No injuries were reported among border guards or migrants. The Lithuanian State Border Guard Service had not publicly disclosed the attack until August 5, 2023, citing ongoing pretrial investigation led by the Alytus District Prosecutor's Office. The tunnel was approximately 11 meters long and located about 9.5 meters inside Lithuanian territory, beneath the patrol road, with no tunnel exits on the Lithuanian side. Lithuanian Prime Minister Mindaugas Sinkevičius criticized the delay in public disclosure and ordered an investigation into the late information release and conduct of border guards. Following investigation activities, the tunnel was filled in. The incident represents an illegal border crossing attempt using subterranean means and a physical assault on state border personnel.