hasn't seen this number of armored vehicles since world war ii. this is the headquarterers of nato. some staff have been told to stay home. it's a union of half a billion people. it's also a city to where hundreds of people have been left to fight for isis and syria. they have good reason to worry about a number of terror attacks. there's been a number of raids overnight. so far, 16 people arrested overnight and we understand another five were arrested in the early hours of this morning. so 22 raids, 21 people arrested and as you can see behind me, troops and police, a thousand police hunting in particular for one man. the man who escaped the massacres in paris. one of the gang, the isis gang a man whose a belgian and seen in a car and driven across the