There are fears over Olympic security after a known terror suspect entered the Olympic Park five times in a single day.
The British-born jihadist was arrested after breaching an order banning him from the area. It's led to fears that he was planning an attack and raises questions over security just days before the Games are due to start.
The 24 year old man, known only as CF, was first arrested four years ago while trying to get to Afghanistan.
He later fled to Somalia where it's believed he was trained by Al Qaeda before being atrested and sent back to the UK last year.
Officers from MI5 believe the man is a would-be suicide bomber.
He was under a control order not to enter any Olympic zone but still travelled through the main Games site in Stratford five times in one day.
It's prompted fears he was carrying out a reconnaissance mission ahead of a planned attack.
Shadow Home Secretary Yvette Cooper talks about her concerns:
Security expert Will Geddes:
Watch Piers Hopkirk's full report here: