The assessment and investigation of all the material recovered is a colossal undertaking,

We have to be vigilant, but you can't predict where or how or when [terrorists] will try.

There has been progress but starting from a regrettably low baseline,

The networks we are dealing with are now global in terms of their operations.

We are always looking for evidential opportunities. We cannot discount anything.

Yesterday's incidents do bear similarities to the bomb attacks in London on July 7 in as much as there were three underground trains and a bus that were targeted. There are other features that are emerging which are also of interest to detectives,