'Thousands' of terrorism suspects being monitored: London mayor Boris Johnson
Britain's security services are monitoring thousands of terrorism suspects in London and are involved in operations on a daily basis, the capital's mayor Boris Johnson said.

Britain's security services are monitoring thousands of terrorism suspects in London and are involved in operations on a daily basis, the capital's mayor Boris Johnson said yesterday.

In August, Britain raised its international threat level to the second-highest classification of "severe", meaning an attack was considered highly likely, with Prime Minister David Cameron warning that Islamic State militants fighting in Syria and Iraq posed the country's greatest-ever security risk.
About 500 Britons are believed to have joined the fighting in the region and the authorities have long argued that radicalised, battle-hardened veterans would pose a grave threat on their return.
However, Johnson suggested that the danger was more widespread.
"Every day - as you saw recently, we had to raise the threat level - every day the security services are involved in thousands of operations," Johnson said.