Five years ago, Congress killed an experimental Pentagon antiterrorism program meant to vacuum up electronic data about people in the U.S. to search for suspicious patterns. Opponents called it too broad an intrusion on Americans’ privacy, even after the Sept. 11 terrorist attacks.

But the data-sifting effort didn’t disappear. The National Security Agency, once confined to foreign surveillance, has been building essentially the same system.

Several thousand law enforcement agencies are creating the foundation of a domestic intelligence system through computer networks that analyze vast amounts of police information to fight crime and root out terror plots.

As federal authorities struggled to meet information-sharing mandates after the Sept. 11, 2001, terrorist attacks, police agencies from Alaska and California to the Washington region poured millions of criminal and investigative records into shared digital repositories called data warehouses, giving investigators and analysts new power to discern links among people, patterns of behavior and other hidden clues.

Newly-released records obtained through a Freedom of Information Act request contradict the 9/11 Commission’s report on the Sept. 11, 2001 attacks and raise fresh questions about the role of Saudi government officials in connection to the hijackers.

The FBI timeline reveals that alleged hijacker Hamza Al-Ghamdi, who was aboard the United Airlines flight which crashed into the South Tower of the World Trade Center, had booked a future flight to San Francisco. He also had a ticket for a trip from Casablanca to Riyadh, the capital of Saudi Arabia.

The official record states that senator Robert F Kennedy, like his brother before him, was killed by a crazed lone gunman. But the assassination of a man who seemed to embody so much hope for a bitterly divided country embroiled in an unpopular war still troubles this nation.

Little about the official explanation of the events at the Ambassador Hotel on June 5 1968 makes sense. Now a new forensic analysis of the only audio recording of the fatal shots has given new weight to a controversial theory that there were in fact two shooters, and that the man convicted of Kennedy’s killing — Sirhan Sirhan - did not fire the fatal shots.

The FBI has awarded a nearly $1 billion contract to Lockheed Martin to help create a massive computer database of people’s physical characteristics as part of an effort to better identify criminals and terrorists.

The overall deal is worth between $850 million to $1 billion and could run as long as 10 years, said Thomas Bush, the FBI’s assistant director of the Criminal Justice Information Services Division.