London explosives made in China? Krautville thinks so, and further that explosives used were new and so sophisticated that they literally cannot be spotted. This from Northeast Intel They link to a story

German newspaper: Explosive material used by British terrorist who blew himself up on Tel Aviv beachfront in 2003 very likely the same as that used by terrorists who staged London attacks last week, Mossad tells Brits

If true, this is dynamite. Further link provided by NortheastIntel is to Ynetnews.
Very long article that spells out intricate links for this Chinese explosive that may be ALL OVER the terrorist world by now.

....the explosive in question is very powerful, and “much more lethal than plastic explosives and can be smuggled undetected due to its composition.

Very scary news.