A man has been arrested and bailed over a cyber attack on the websites of the Home Office and the Home Secretary, Scotland Yard said.
The 41-year-old was held at his home in Stoke-on-Trent on suspicion of encouraging a distributed denial of service attack on the sites.
He allegedly targeted the Home Office and Theresa May's constituency websites and urged others to take part in the attack online.
Distributed denial of service attacks are designed to overwhelm websites so they crash.
The man was arrested on suspicion of assisting or encouraging crime contrary to the Serious Crime Act 2007 and later bailed until mid-December.
Scotland Yard said material including computers, telephones and media storage devices were seized from his home.
Detective Inspector Jason Tunn said: "Assisting and encouraging cyber crime is a serious matter and I would advise all persons to consider their actions and any possible future consequences prior to posting any material online."