Boston Marathon 'Explosion'

Katty Kay in Washington at the moment (it's the World News America timeslot). Presume Babita/Katty jointly presenting?

And BBC did in the Headlines of 10.

They have moved onto other stories already - wise move as rest is speculation for now. Will no doubt return to it later in bulletin

Clive sitting with Babita in C now.

Clive Myrie now joined Babita in C. Katty Kay contributing from Washington.

We haven't any live pictures from the ground recently... Understandable I guess.

In Mark Mardell's report he said 'One lady fell over, shocked by the blast' or something along those lines... When clearly she ran into another person and was tripped.

Pretty good package put together by Mark Mardell in a relatively short space of time.

Now a 3rd explosion at JFK Library. Have the or the news agencies speculated as to who is responsible?

I think Sky were reporting that, before the press conference took place. AP were the first agency to report the third I believe.

Although on a smaller scale it reminds me a lot of the London bombings.

Sky said their colleagues at Fox are suggesting there is a person of interest but sky are not going to qualify that

World News America just started now on the NC with Katty Kay

For anyone interested, this was from the live marathon feed, the moment it happened.

Good timing for Gordon Corera to arrive in DC.