Whistle-blowing site WikiLeaks has said it's under attack.

"We are currently under a mass distributed denial of service attack," said a tweet posted Sunday morning from the @wikileaks handle.

The Tweet was posted shortly before the WikiLeaks unloaded more confidential documents through The New York Times and The Guardian. Nearly 250,000 diplomatic cables were released, giving "an unprecedented look at backroom bargaining by embassies around the world, brutally candid views of foreign leaders, and frank assessments of nuclear and terrorist threats," the Times said. The documents are mostly from the past three years, and will be released in a few installments.

WikiLeaks first announced the release of the documents last week, although it did not reveal many of the specifics.

"Next release is 7x the size of the Iraq War Logs. Intense pressure over it for months. Keep us strong," the organization tweeted.

It seems that for now, WikiLeaks has fallen victim to some of this pressure. As of publication time, wikileaks.org is still crippled.

The White House responded to Sunday's leak in a statement.

"President Obama supports responsible, accountable, and open government at home and around the world, but this reckless and dangerous action runs counter to that goal," it said. " By releasing stolen and classified documents, WikiLeaks has put at risk not only the cause of human rights but also the lives and work of these individuals. We condemn in the strongest terms the unauthorized disclosure of classified documents and sensitive national security information."

Although this release is one of the largest, it certainly isn't the first for WikiLeaks. Cablegate, as WikiLeaks has referred to it, is the third time the organization has leaked a significant amount of secret information. In July, it unloaded around 90,000 secret documents related to the war in Afghanistan. Last month, WikiLeaks published published nearly 400,000 secret Iraq war documents in what it said was the largest leak of confidential military information in U.S. history.