A group of hackers who breached the Senate computer system earlier this week claimed responsibility for problems with the CIA's website today. The group, known as Lulz Security, tweeted 'Tango down - CIA.gov,' and there were difficulties throughout the early evening accessing the agency's website. The computer mischief appeared to be targeting the CIA's public website, which does not include classified data and has no impact on the CIA's operation. CIA spokesman Marie Harf said the agency is looking into the reports.