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More on the bombs' military origin

London explosives have military origin

LONDON, July 13 (UPI) -- Scotland Yard has asked for European cooperation in finding how last week's London subway and bus bombers obtained military plastic explosives.

Traces of the explosive known as C4 were found at all four blast sites, and The Times of London said Scotland Yard considers it vital to determine if they were part of a terrorist stockpile.

C4 is manufactured mostly in the United States, and is more deadly and efficient than commercial varieties. It is easy to hide, stable, and is often missed by traditional bomb-sniffing detection systems, the newspaper said.

Forensic scientists told the newspaper the construction of the four devices detonated in London was very technically advanced, and unlike any instructions that can be found on the Internet.

The attacks in the morning rush-hour Thursday killed at least 52 people, and injured more than 700. At least four British bombers, three of Pakistani descent are among the dead.

Another man was arrested in West Yorkshire Tuesday, but no further details have been released.

London bombers used 'military' explosives

LONDON, July 12 (UPI) -- High-grade military explosives appear to have been used in the London bombings last Thursday, a senior French counter-terrorism officer has said.

"The nature of the explosives appears to be military, which is very worrying," said Superintendent Christophe Chaboud, the chief of the French anti-terrorist police, who was in London to assist Scotland Yard with the investigation.

Detectives have concluded that a single bomb maker built all four devices as similar components were found at all four blast sites, the Times of London reported Tuesday.

British intelligence officials have asked their European counterparts to check military stockpiles and commercial sites to determine is explosives are missing, European-based intelligence officials told the New York Times.

But one official said the only "concrete evidence" was that the explosives were not homemade. "We don't know if they are civil industrial or military industrial explosives."


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