It's not every day that subway riders in Washington, D.C., share a seat with an al Qaeda terrorist, but newly released documents show it happened.

Judicial Watch, a nonprofit watchdog group, has obtained documents showing the Federal Bureau of Intelligence was trailing U.S.-born al Qaeda leader and identified terrorist Anwar al-Awlaki as he walked up to the front door of the Pentagon before a luncheon with U.S. officials in 2002.

Al-Awlaki, whose name is spelled al-Aulaqi in the 250 pages of surveillance logs, was spotted by the FBI's Special Surveillance Group at a Virginia shopping mall boarding "the Metro train, blue line north for the Pentagon."

The Pentagon, which is in Arlington, Va., across the Potomac River from the District of Columbia, has its own station on the D.C. subway system, which is referred to by locals as the Metro.

At the Pentagon Metro station, which is served by both the blue and yellow Metro lines, the FBI saw al-Awlaki being greeted by "two unidentified white females" after going through the turnstiles.

He was then followed up the escalator and trailed as he walked up to the Pentagon's entrance. At noon, "surveillance discontinued," the documents reveal.

"It’s beyond comprehension that the FBI, charged with protecting the United States against terrorism and foreign intelligence threats, followed a known terrorist to the Pentagon for his high-level meeting with top officials," Judicial Watch lamented.

Judicial Watch made other documents public in July that revealed the FBI knew al-Awlaki was a "terrorist organization member" and to "approach [him] with caution."

He was killed in an American drone attack in Yemen on Sept. 30, 2011.