Kiev: New cyberattacks hit Ukraine’s Odessa airport, the metro system in Kiev and Russian business newswire Interfax that made part of its services unavailable to subscribers.

Ukraine’s state-run Computer Emergency Response Team (CERT) said a new wave of hacks was hitting the country and asked the transport networks to be on particular alert.

Ukraine was the chief victim of a major cyber attack earlier this year, and the government had warned on 13 October that another strike might be coming.

“We ask the owners of telecommunication systems, other information resources, transport infrastructure first of all, as well as ordinary internet users, to comply with stricter cyber security requirements," CERT-Ukraine said in a statement.

Engineers are working to restore access to services after the news service faced an “unprecedented virus attack," Interfax director Yuri Pogorely said on his Facebook page.

At least three Russian media outlets were attacked with a ransomware virus called Badrabbit, according to Moscow-based cybersecurity firm Group-IB, which declined to name all of the targets.

“It also counted state institutions and strategic objects in Ukraine as its victims," Group-IB said of the attack on media outlets on its Telegram channel.

Ukraine’s cyber police and the infrastructure ministry said that Tuesday’s strikes did not appear to constitute a mass attack. The central bank said the banking system was working normally.

Odessa airport said it had tightened security measures while the Kiev metro reported an attack on its payment system.

“We report that the IT system of Odessa international airport has been hit by a hacker attack. All services of the airport are working in a stricter mode," the airport said in a statement.