Ukraine mobile network Kyivstar down by 'cyber-attack'
Customers have been left without phone or internet access, while one city's air raid sirens stopped working. Kyivstar's chief executive implied Russia could be responsible.
Ukraine's security services are investigating. Moscow hasn't commented.
The Kyivstar network is estimated to have some 24 million mobile customers and a million home internet users.
Reports emerged on Tuesday morning that people and businesses had lost mobile and internet signal.
Air raid sirens in the north-eastern city of Sumy also malfunctioned as a result of the outage.
Military authorities in the area announced they would send out police and emergency vehicles to alert residents of any incoming missile or drone strikes.
Ukraine's largest bank, PrivatBank, said some cash machines were not working and might be "unstable" or "have no connection".
An investigation has been opened by the Security Service of Ukraine (SBU).
"One of the versions currently being investigated by SBU investigators is that the Russian special services may be behind this hacker attack," SBU said in a statement.
Russia has not commented and no-one has yet claimed responsibility.
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