It is unsurprising that the general public are living in fear at the moment.
After weeks of international attacks – leaving 129 dead in France, 224 dead on a Russian passenger jet, and 43 dead in Lebanon – intelligence analysts and administration officials have been forced to admit that they underestimated the reach of Islamic State extremists.
And now the National Counter Terrorism Security Office (Nactso) have published official guidelines on what we should do if we find ourselves caught up in a Paris-style attack.
What should I do if there's a terror attack?
RUN, HIDE, TELL
RUN
HIDE
TELL
However, despite the growing feeling of unease, Prime Minister David Cameron has told the public that the best way to fight terrorists is to carry on with our lives as normal.
He told PMQs people wanting to travel to France should "carry on with their business" as usual, adding: "One way we can defeat terrorism is to show them we will not be cowed."