One more man arrested in London Blast.

A second man has been arrested in connection with the London subway attack, in what was the clearest indication yet that authorities do not believe the person who planted the bomb acted alone.

Police force said a 21-year-old man was arrested shortly before midnight on Saturday in the west London borough of Hounslow.

Two men are in custody for possible roles in the bombing attack on a rush-hour subway train Friday morning that injured 30 people in London, including an 18 yeal old man arrested on Saturday in the departure area of the port of Dover.

-