The Parsons Green bomb could have caused huge devastation if the main explosive component had ignited as intended.
Experts said the bomb, which was apparently reliant on a string of fairy lights attached to a battery, appeared to have malfunctioned several stations before it was due to explode.
The crude device, packed into a builder’s white bucket and carried in a Lidl cool bag, exploded on a packed London Underground train shortly before 8.30am. injuring at least 22 people, including a boy believed to be aged about 10.
http://www.telegraph.co.uk/news/2017...killed-dozens/