KIEV, June 27 (Xinhua) -- The information systems of Ukraine's critical infrastructure were not affected by the cyber attack that hit the country on Tuesday, Ukrainian Prime Minister Volodymyr Groysman said.
"It was an unprecedented attack, but our IT-experts are doing their job and protecting critical infrastructure. Important systems have not been affected," Groysman wrote on Facebook.
Earlier in the day, the State Security Service of Ukraine said that a number of the country's government agencies and private companies were affected by the ransomware attack.
The websites of the Ukrainian cabinet and several ministries, the country's power distributor, the state railway operator, the largest airport, several banks, and a string of retail and fuel networks have been hit by the attack.
Local experts estimated that the attack, which has affected about 80 websites, was the largest in Ukraine's modern history.