was an act of islamist terrorism. the concern will be a group like al qaeda or isis could be behind it. groups with networks of operatives who have cell structures which they can potentially put into operation for these kind of attacks. it shouldn't be ruled out this could be a single individual, somebody who has managed to put a device together just on their own. we have seen isis over these encrypted apps online reach out to sympathizers and operatives in the west providing detailed bomb making instructions. they will be doing a lot of forens fo forensifo forensics to see what was used. was it thtp which is a signature for isis and its attacks in europe, notably in paris, in brussels. or was it some other type of