The attack on Berlin was not the first time that an individual monitored by security services has gone on to strike terror into the heart of Europe, and points to the growing challenges European intelligence services face in their attempts to keep the continent safe.
However, this result is not as remarkable as we would expect to find it, taking into account that the probability of seeking formal health services among those individuals covered by social security services is less than 50% in any year: 36.92% in 2000 and 40.31% in 2006 (Table 3).
PII is the procedure under which the public authorities - from the police to the security services to individual government departments - can apply to the courts or a coroner to remove from a legal case material would be damaging on several narrow grounds, including endangering national security or international relations, if disclosed.
As more and more high-profile figures become the targets of public anger, there's been an increase in demand for security services for individuals.
In the shorter term, he wants to poach "exceptional individuals" from "the military, the security services, industry, commerce and the professions" and train them to become superintendents, a higher rank than inspector, within 15 months.
This connection was further strengthened by the fact that Danish security services claimed the individual was already part of an investigation into Danish groups linked to the Shabab (one report in the Danish press said he had been involved in a Shabab plot in Kenya which targeted Hilary Clinton).
One problem for security services is that individuals who have only supported militants without acting violently themselves can easily and swiftly become bombers or gunmen in certain circumstances – such as the detention of a key member or orders from more senior commanders perhaps outside of the country.
They also served as a surveillance system, aiding the security services in locating individuals with views critical of the RCC, leading to the arrest of Ba'athists, Marxists and Islamists.
Speaking during a visit to Cardiff, Cameron declined to comment on individuals but said that the police and security services would not rest until such extremists had been stopped.
He also put forward a scheme for superintendent level in a bid to attract "exceptional" individuals from other fields including the military, security services and industry.
