Passenger Karl Elliker allegedly told a Chevron station clerk that "he was sorry but he had to rob the place," KOMO reported.
The 24-year-old suspect demanded $20 bills from the register and told the clerk he was "desperate" for money after serving in the military. The clerk told him he had no more $20s because he just did a cash drop and Elliker left in the cab.
When the cab was stopped and Pierce County Sheriff's Office deputies arrested Elliker, he admitted he didn't have a bomb. Elliker has been charged with attempted robbery.
Although the "Sheriff's Office was unable to find any previous convictions for Elliker," a then-20-year-old man named Karl Jakob Elliker pleaded guilty to one count of unlawful possession of a destructive device after being caught with a pipe bomb in Oregon in 2009.
"Honestly, I just made it ... to blow it up in a rock quarry with friends," Elliker said, according to the Register-Guard. "I thought that was about the safest place to do it...I regret that I did it."