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4. The detonation method, using light bulbs and an electric current, is identifical and common with other successful IED's.
5. Device at Parsons Green has used a timer to detonate the initial part of the device. We haven't actually seen this in UK before.
6. The IRA are the only terrorist group who have used timed devices in mainland UK, and we've not seen the likes of this 2001.
7. Assuming this isn't IRA, and that seems unlikely, a timed device is a significant departure from anything Islamists/right wing have done
Copeland used timing devices in his nail bomb attacks on London in 1999, but we've not seen the likes of this for many years.
