Closed-circuit television

Hassan's family believe he must have been assaulted while in custody hours before he died.
West Midlands Police also under fire as local MPs question how suspect was able to go on "two-hour spate" that left one man dead.
Bravery, 18, admitted attempted murder after throwing the six-year-old boy from the 10th floor.
Shocking video shows moment 79-year-old was attacked in Kettering.
CCTV footage shows a cyclist headbutting a pedestrian following a near hit and disagreement. The City of London Police are currently searching for him.
"A cyber war against Chinese artificial intelligence."
On average 17 men disappear each year after, and most are later found dead in rivers and canals.
The court also heard the attackers may have originally planned to hit Oxford Street.