The fresh intelligence that led to yesterday’s extraordinary terror alert comes from documents discovered after Pakistani and U.S. forces broke up an al Qaeda cell in Gujrat, Pakistan, eight days ago, U.S. intelligence officials said yesterday. One of the men arrested in that raid led authorities to the documents, which contained the startling details of al Qaeda surveillance of corporate and government targets in Washington, New York and New Jersey. Officials from several U.S. intelligence and law enforcement agencies huddled virtually round-the-clock Friday, Saturday and Sunday to discuss the fast-emerging information, government sources said, assembling intelligence from the arrested al Qaeda operatives and translating and culling through the documents. Full Story