1. National Police of Ukraine spokesman Yaroslav Trakalo walking out of Interior Ministry building
2. Various of sign reading (Ukrainian and English): "Ministry of Internal Affairs of Ukraine"
3. Set up of Yaroslav Trakalo, National Police of Ukraine spokesman:
4. SOUNDBITE (Ukrainian) Yaroslav Trakalo, National Police of Ukraine spokesman:
"A massive attack on computer networks occurred today. As of now, the cyber police have received about 200 complaints about operating system failing on personal computers."
5. Trakalo's hands holding documents
6. SOUNDBITE (Ukrainian) Yaroslav Trakalo, National Police of Ukraine spokesman:
"According to preliminary information, computers were affected by the spread of a harmful software which uses recently found defects of the Windows operational system."
7. Trakalo speaking to media
8. SOUNDBITE (Ukrainian) Yaroslav Trakalo, National Police of Ukraine spokesman:
"We registered all the complaints, specialists at the Cyber Police immediately left to to go to places where the reports are coming from, they are working on stopping this harmful software from spreading and eradicating the consequences."
9. Exterior of Oschadbank targeted by cyber-attack
10. Woman attempting to enter bank
11. Man collecting card from ATM
12. Close up of phone screen showing Oschadbank website with message reading: "We apologise for the inconvenience caused by a force-majeure event."
Hackers have caused widespread disruption across Europe, hitting Ukraine especially hard.
Company and government officials reported major disruption to the Ukrainian power grid, banks and government offices, where one senior official posted a photo of a darkened computer screen and the words, "the whole network is down."
Ukraine's National Police spokesman Yaroslav Trakalo told reporters on Tuesday that they had received around 200 complaints reporting computer system failures and that members of the cyber police were "working on stopping the harmful software from spreading".
There's very little information about what might be behind the disruption at each specific company, but cybersecurity experts rapidly zeroed in on a form of ransomware, the name given to programmes that hold data hostage by scrambling it until a payment is made.