“This may represent a significant breakthrough,” said Sir Ian Blair, commissioner of the Metropolitan Police.
Police also say they are finding significant clues in the unexploded bombs, including keys as to who built them.
“They’ve almost certainly recovered some of the explosives intact, and that will tell them a great deal about these explosives’ mix,” explained Michael Clarke, professor of defense at King’s College in London. “They’ve probably got the detonators.”
Today’s findings will add to the forensic evidence already gathered over the last two weeks.
The first set of bombers left behind two small, pillbox-sized bombs in their rental car at a train station. Meanwhile, British police discovered large quantities of bomb-making materials at the Leeds apartment now known as the bomb factory.