WASHINGTON – A group of hackers who breached the Senate computer system earlier this week claimed responsibility for problems with the CIA’s website Wednesday.

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 CIA operations.

It is sometimes difficult to tell if a website has been hacked, or if the claim alone drove so many people to the site that it crashed. Efforts to access the website were met with an error message long after the breach began, around 6 p.m. EDT.

Lulz has claimed credit for hacking into the systems of Sony and Nintendo and for defacing the PBS website.