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The evacuation plan unveiled on Wednesday identifies 150 routes out of Vilnius and assigns neighbourhoods with specific evacuation points, Lithuanian public broadcaster LRT reported.

The complex search and rescue mission has included the US Army and Navy, plus Lithuanian and Polish Armed Forces in an effort that has required "tremendous resources", the statement said.

The Lithuanian army says it is searching for four US soldiers missing for two days during drills in the Baltic state amid reports they had died.

Polish and Lithuanian poultry associations said on Friday they had also been approached by US embassies regarding possible egg exports, the AFP reported.

Lithuanian prosecutors say Russia's military intelligence service GRU was behind an arson attack on an Ikea furniture store in the Baltic state's capital Vilnius last year.