According to the BBC:
Three of the devices found were the same size and weight as those used for the 7 July London bombings, while the fourth was smaller and appeared to have been contained in a plastic box. The same chemicals appear to have been used.
Scotland Yard Assistant Commissioner Andy Hayman told the news conference: “At this stage it is believed the devices consisted of homemade explosives and were contained in dark coloured bags or rucksacks. It is too early to tell how these were detonated.”
BBC security correspondent Gordon Corera told BBC Radio 4’s Today programme the devices were so similar there was speculation they could have been part of the same batch.
“The explosive might have degraded over time or had not been put together right in this case, or it could have been a completely different batch of explosives – homemade – that had not been cooked up properly.”
The bombers’ plan might have been disrupted by the investigation into the 7 July attacks, forcing them to act before they were fully prepared, Mr Corera added.
Of course, none of the options are good. Coordinated attacks mean a larger terror network. Uncoordinated attacks suggest a process of mimetic emulation. While the former might be more dangerous, it would also be, in theory, easier to disrupt.
Daniel H. Nexon is a Professor at Georgetown University, with a joint appointment in the Department of Government and the School of Foreign Service. His academic work focuses on international-relations theory, power politics, empires and hegemony, and international order. He has also written on the relationship between popular culture and world politics.
He has held fellowships at Stanford University's Center for International Security and Cooperation and at the Ohio State University's Mershon Center for International Studies. During 2009-2010 he worked in the U.S. Department of Defense as a Council on Foreign Relations International Affairs Fellow. He was the lead editor of International Studies Quarterly from 2014-2018.
He is the author of The Struggle for Power in Early Modern Europe: Religious Conflict, Dynastic Empires, and International Change (Princeton University Press, 2009), which won the International Security Studies Section (ISSS) Best Book Award for 2010, and co-author of Exit from Hegemony: The Unraveling of the American Global Order (Oxford University Press, 2020). His articles have appeared in a lot of places. He is the founder of the The Duck of Minerva, and also blogs at Lawyers, Guns and Money.
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