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>> jenna: what is the difference? >> support people and bomb maker and hiding place and operational cell would be other individuals like the bomber who perhaps are staging for attacks. and that's why the urgency is. there when you read between the lines of what the british are doing, that speaks to urgency. but again, the difficulty in the global environment, there is a lot of the places if someone is aware of how to avoid detection, they can you know, pull this all. you will never be able to stop every attack. that's a simple fact. and the british intelligence services are some of the very be...

The suisicide bomber as his father is speaking out claiming that his son is innocent. all will the while confirming that two of his other sonses are under arrest. rick is on the ground in manchester with this investigation and the desire to try to prevent another attack continues, hi, rick. >> reporter: hi, leland, the british police confirmed that the 23-year-old arrested in manchester is the older brother of the suicide bomber salman abedi. and his other brother was arrested in libya with connections to isis. this had is as in man chester and england as the authorities search for accomplices...

>> manchester is is the third most populs city in england and a big cultural center for the british society. but i think the interesting point in terms of all of those in manchester suggest intelligence indicating connection points to other individual in manchester per se rather than people spread across the country. in some sense that might be positive because it allows you to dedicate resources to a localized area. and the number of arrest that we are seeing don't take into that it is wrapped up. the british counter terrorism on the attack is arrest anyone who was in contact, regular contact...

This is something you have wrote about, tom, about the device use onned in the attack being and what does it tell us? >> the first issue is because of the explosive power, because of the ability of the bomb maker to make it in a way that went undetected. it suggest skill, training and also suggest that someone really knows what they are doing and at this point probably not been captured and so there is a great concern and as rick said what happens next and in the coming days? i think that is why you see is a sense of urgency to arrest who ever is responsible. >> jenna: why manchester? why does...

And a big rig out of control leads to a deadly wreck. it is all "happening now". >> jenna: breaking development in the deadly manchester terror bombing. there are growing fears another attack is imminent and they are now investigating a terror network. welcome to the second hour of "happening now". i am jenna lee. >> leland: i am leland vitter in for jon scott. british police are now carrying out raids across the city of manchester and arrested a fifth suspect in the bombing. all of the meantime, military personnel were deployed to high profile sites in great britain as the prime minister rais...