Two cars loaded with gasoline and nails found abandoned in London Friday . The two men were arrested on suspicion of possession of a firearm without a license or ammunition for a firearm. British capital wracked by violence by the IRA for years .
Two cars loaded with gasoline and nails found abandoned in London Friday . 52 people killed on July 7 , 2005 after bombs exploded on London bus , trains . British capital wracked by violence by the IRA for years .