Different slant here: Sources told Fox News that the pressure cooker may have been part of a propane tank used in a food truck.
“[The owners’] story checked out,” said one source. “But we wanted to neutralize it.” http://www.foxnews.com/politics/2015/05/25/one-arrested-after-bomb-squad-checks-suspicious-vehicle-near-us-capitol/
Meanwhile, it also says they arrested him.
“Say, did you hear an explosion?
No. It was just the police.
The police?
Yeah, they’re blowing stuff up again.”
Leave a car or truck near the Capitol, cause a panic.
Huh? How about, "Sources told Fox News that the pressure cooker and propane tank may have been intended for use in a food truck."
(Meanwhile, a bazillion Crown Victoria taxi cabs driven by guys in head scarves fade into the DC background.)