Police give warning that bombers may strike again: “A main concern is that they are dealing with “clean skins”, possibly British-born terrorists who have not crossed the intelligence radar before. Whoever the killers are, they have access to high explosives and bomb-making expertise.

A police source told The Times: “Our main fear is that this group is out there still sitting on a cache of high explosives knowing that their bomb designs worked.” (Times of London)