POLICE IN BRITAIN HOLD SOMALI MAN IN 2ND BOMB PLOT.

Reports that British police arrested a Somali man believed to be one of the bombers behind the London attacks of July 21, 2005. Author's view that the arrest is the biggest breakthrough yet in the investigation; Review of the arrest, in which a twenty-four year old British resident named Yasin Hassan Omar was subdued by authorities in a predawn raid in Birmingham; Report from a senior European intelligence officer that the house in which the suspect was arrested contained finished bombs and a variety of bomb components.