Bomb pulse dating
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More armed police will be deployed to the streets while soldiers will take over a number of security functions such as manning power stations.
In May this year, a radicalised former doorman Zahid Hussain was found to have built an explosive device in his bedroom with fairy lights, shrapnel and a pressure cooker.
It is super sensitive just after being made and can go off very easily.
However, it doesn't remain sensitive for very long, it deteriorates quickly.' In that instance, a group of Islamic terrorists planned to carry out a copy-cat attack to 7/7, but although the detonator part of the bombs went off, they did not ignite the explosives and only one person was injured.
He bought most of the items he used for his bombs over the internet.
Seventy-one years ago Saturday, a United States B-29 bomber named the "Enola Gay" dropped the atomic bomb "Little Boy" over the Japanese city of Hiroshima.
Mr Hunter told Sky News: 'When I saw the bucket and when I saw it burning, it looked exactly like the 21/7 device.' The Mother of Satan has been used in several terrorist attacks, including 7/7 and the Manchester Arena bombing.
He added: 'There are very few chemical compounds readily available to jihadists that can be used to make a high explosive so the main charge will also certainly be TATP.'This substance is also known as the Mother of Satan.An ex-Army bomb disposal officer said he believed the bomb could have been the Mother of Satan explosive used in the failed 21/7 terror plot.Chris Hunter said the bombmaker 'almost certainly' used triacetone triperoxiede (TATP), a sensitive and highly explosive material used by jihadists.Explosives experts say the Parsons Green bomb could have killed dozens if it had properly detonated at rush-hour this morning.Anti-terror police are now examining the bucket bomb which failed to fully go off on a tube train in west London as they try to track down the bomber.The Metropolitan Police Assistant Commissioner told reporters: 'We are making excellent progress at the moment as we pursue our lines of inquiry to identify, locate and arrest those responsible.'We have hundreds of police officers trawling through CCTV footage, detectives have spoken to tens of witnesses and we have taken a large number of calls from to the hotline... 'Indeed members of the public have sent in so far 77 images and videos of the scene...