Airport security procedures were tightened after a plan to carry-on otherwise innocuous materials that were to be combined to make an explosive mixture.
The plot was foiled, and no such event too place.
Meanwhile, several guys carried explosives onto trains and a bus, and detonated these, killing and injuring many passengers.
No procedures have been introduced to monitor those who might repeat these outrages.
I recently travelled on a London Underground train on the very section as that which the bomber travelled on the morning of 7th July (Kings Cross to Russell Square).
With me was my son who had been in the adjacent carriage to the bomber on that day:-
We were surrounded by passengers travelling with suitcases and rucksacks, and the carriage was crowded. It was a similar time of day, too.
I found it very emotional . . .