KYIV, Aug 7 - Officers from the cyber crime department have detained a male resident of the town of Nikopol, the Dnipro region, who they believe has been involved in disseminating the computer virus called Petya.A and infecting about 400 computers.

Ukrainian police determined that a 51-year-old Nikopol resident posted on some file hosting services (cyber lockers) and social networking sites a video footage containing a detailed guide to running the Petya.A virus on computers, the Ukrainian cyber police said in a statement on its website.