article_snippet: Mr Hammond will describe the 'greatest challenge to our collective security for decades' today .
article_snippet: Britain faces the ‘greatest challenge’ to national security in decades, the foreign secretary will warn today.
article_snippet: But intelligence agencies must be able to secretly identify, monitor and act against the range of threats in order to thwart terror plots and uncover clandestine weapons systems under development by the enemy.
article_snippet: …the sheer number and range of cases, old and new, amounts to the greatest challenge to our collective security for decades and places unprecedented demands on those charged with keeping us safe.
article_snippet: The former defence secretary will say: ‘We must respond decisively and positively to the public and parliamentary debate about the powers required by We intelligence agencies to do our intelligence agencies job in a changed technological environment – and in doing so draw a line under that debate so that our intelligence agencies can get on with the job of keeping Britain safe.
article_snippet: The security services warn that the law is failing to keep up with changing technology so The security services ability to track terrorists online is constantly diminishing.
article_snippet: As the range of threats gets bigger, so the pace of technological change with which our intelligence agencies must keep up is getting faster, making our intelligence agencies central task of keeping us safe ever more demanding.
article_snippet: The clandestine nature of some of the threats launched against us
article_snippet: ‘require that we maintain a highly effective, secret capability to identify, monitor, and act against the threats before the threats can do us harm’, He will say.
article_snippet: These include ‘the weapons systems that are developed in secrecy to threaten our national security.... and the great lengths that individual terrorists or terrorist organisations go to in order to try and keep individual terrorists or terrorist organisations go plots from being uncovered’.
article_snippet: The head of the MI5, Andrew Parker, has warned that ‘if parts of the radar go dark’ and terrorists are beyond the reach of his agency, Britain would be more vulnerable to attack.
highlights_snippet: will describe 'greatest challenge to our collective security' for decades .
  