My neighbour was warned when he went back to work on the buses in Nottingham to be aware of un-attended parcels and baggage
This is something people should be aware of, if you see something that is left with no obvious person in charge, dont be afraid to alert someone to it, albeit some one in the shop, or an official if out in the open street
Although it is not known if this was suicide or parcel type bombs, dont think this could only happen in london, it can be anywhere from a village to any city. Even around military establishments, they will be on alert too