The bomb was in the Haymarket, near the popular Regent Street shopping area, and security sources say it could have been timed to coincide with Gordon Brown's first day as Prime Minister.
An eyewitness said a man had crashed the vehicle into bins near Tiger Tiger and then ran off, before the alarm was raised.
The timing coincided with hundreds of revellers leaving nightspots, but police said there was no intelligence to suggest such an attack.
Senate Republicans' $1 Trillion COVID-19 Relief Bill Includes Billions for New Fighter Jets, Attack Helicopters, and Missiles
Much of the military spending in the GOP's HEALS Act replaces funding that was redirected to pay for Trump's border wall.
"Environmental humanism will eventually triumph over apocalyptic environmentalism."
In two-thirds of those cases, there were no accompanying arrests.
Ricky Dale Harrington, Jr., is running to keep Tom Cotton out of the White House.