Latest: A homemade bomb has been found in the hijacked truck used to kill four people and wound 15 others in Stockholm, according to local media reports.

Swedish police said they found drugs and a stun gun on board a tour bus used by pop singer Justin Bieber.

A cleaning lady stole an empty commuter train from a depot, taking it on a joyride to a suburb of Stockholm where it derailed and slammed into an apartment building.