An armed suspect stole a roadway-construction truck and led authorities on a dangerous chase over the 10 Freeway in Los Angeles County Tuesday night, authorities said.

The truck was hauling a freeway sign in back, sending up sparks as it dragged along the surface of the road in the Ontario and Pomona areas.

The chase finally ended when officers inside a BearCat armored rescue vehicle pulled alongside the truck and pinned it in the median, an ABC7 video shows. The suspect jumped out, dodging traffic in freeway lanes until he was taken down by a police K-9, officials said.

Police say they recovered a gun that apparently was thrown over a freeway wall by the suspect.