Ransomware attacks: Putin says Russia is not responsible - as it happened

Health secretary Jeremy Hunt breaks his silence to say NHS has not suffered second wave of attacks

• Did you pay money as a victim of ransomware?
• How to protect your computer

3.03pm BST

We're closing the liveblog coverage now. Here's our latest story from my colleagues Haroon Siddique and Jessica Elgot. Thanks for reading.

Related: Warning of NHS cyber-attack risk was not acted on, says cybersecurity adviser

2.45pm BST

The Guardian has spoken to an IT worker whose company has paid out in total around 80,000 to ransomware attackers over the last year, most recently following an attack three months ago.

The 34-year-old IT support worker in the UK, who wishes to remain anonymous, said once the ransom was handed over, those behind the attack were "very, very helpful".