British police have detained 57 suspects in a week-long crackdown on cyber crime, the government said on Friday. The arrests were made in 25 police operations across the country, for offences including data theft from government and company networks, online fraud, denial-of-service attacks, and development of computer viruses and malware. Among those detained was a 21-year-old man accused of joining a group of hackers who stole 400,000 Yahoo email addresses and passwords and published them online in 2012, the National Crime Agency said. West Midlands police arrested a 23-year old man on Wednesday charged with hacking into the US defence department's communications system