British Police have made what they are calling a significant arrest in connection with the bomb attack on a London subway on Friday.
Sources say an 18 year old man was picked up in the port area of Dover and will be returning to London for questioning.
The IED, which was an explosive in a bucket injured 29 people who were either burned by the blast or trampled in the ensuing panic.
Meantime, the U.K. has put its threat assesment level to critical meaning another attack is imminent.
