Via the AP: London Probes Attackers’ Deaths in Blasts

At least three of the suspected bombers came from the West Yorkshire region, which includes Leeds, said Peter Clarke, head of the Metropolitan Police anti-terrorist branch.

Closed-circuit TV video showed that all four had arrived at King’s Cross station by 8:30 a.m. on Thursday, about 20 minutes before the blasts began that killed at least 52 people, Clarke said.

One of the subway bombers likely died in the attack:

In a Scotland Yard news conference, Clarke said police had “strong forensic and other evidence” that the man believed to have carried a bomb onto the subway train that exploded between the Aldgate and Liverpool Street stations died in the blast, and they were awaiting confirmation from the coroner. Police were trying to determine whether the other three also died in the explosions.

And it certainly seems that the bus bomber did as well:

One of the suspects had been reported missing by his family at 10 p.m. Thursday, and some of his property was found on the double-decker bus in which 13 died, Clarke said. The family said the man had traveled to London with three other men.

Some witness accounts suggested the bus bomber may have blundered, blowing up the wrong target and accidentally killing himself. Media reports have quoted an eyewitness who got off the crowded bus just before it exploded as saying he saw an agitated man in his 20s fiddling anxiously with something in his bag.

“Everybody is standing face-to-face and this guy kept dipping into this bag,” Richard Jones, 61, of Berkshire, told the BBC.

One theory suggested the attacker may have intended to leave his bomb on the subway but was unable to board because his coconspirators had already shut the system down.

That his family reported him missing certainly would indicate that they, at least, did not know what he was up to.

If all four are, in fact, dead, the question becomes how many others might have known of the plan. I find it unlikley that they were only four with specific knowledge, but it is possible, I suppose.

The entire piece is worth a read, as it reveals a number of details about the ivestigation to this point.

h/t: James Joyner.