(Adds Lithuanian reaction, context)
LONDON, June 28 (Reuters) - Russian hacker group Killnet told Reuters that it was continuing a major cyber attack on Lithuania on Tuesday in retaliation for Vilnius's decision to cease the transit of some goods under European Union sanctions to Russia's Kaliningrad exclave.
Lithuania's Prime Minister Ingrida Simonyte told reporters in Vilnius her government institutions are working 24 hours per day to "fix the problems as they are found".
"This is not the first attack. We have experienced many cyber attacks beginning with Feb. 24", she said, referring to the day of Russia's invasion into Ukraine.
The earlier attacks included intense scanning for vulnerabilities in government's computers, the PM said.
European Union foreign policy chief Josep Borrell said last week Lithuania "only applies the European Union sanctions" in ceasing transport of certain goods to Kaliningrad, and has not taken any unilateral decisions. (Reporting by Guy Faulconbridge in London and Andrius Sytas in Vilnius Editing by Raissa Kasolowsky)