They may have found quite a few clues already. They have cameras out the ying yang in London; between those and the witness who said he saw someone "fiddling with a package" on the bus, as well as muc physical evidence. Scotland Yard will be very busy finding the perps.

It's up to your friends, but I take all the "chatter" with a grain of salt. A couple of years ago the intel community figured that "chatter" was an attempt at psychological warfare against citizens.