An Avon and Somerset Police spokesman said: "Two people have been arrested on suspicion of causing death by dangerous driving."
More top news
Spanish prime minister Mariano Rajoy said he wants permission to dissolve Catalonia's government and to call an early election.
Egyptian security officials say at least 55 policemen have been killed in a shootout during a raid on a militant hideout near Cairo.
Explosives experts were called to the nuclear reprocessing site in Cumbria, to help deal with chemical substances.