Despite his Nottingham University supervisors insisting the materials were directly relevant to his research, Rizwaan Sabir, 22, was held for nearly a week under the Terrorism Act, accused of downloading the materials for illegal use. The student had obtained a copy of the al-Qaeda training manual from a US government website for his research.

The case highlights what lecturers are claiming is a direct assault on academic freedom led by the government which, in its attempt to establish a “prevent agenda” against terrorist activity, is putting pressure on academics to become police informers.

Sabir’s solicitor said: “This could have been dealt with sensibly if the university had discussed the issue with Rizwaan and his tutors. This is the worrying aspect of the extension of detention [under the Terrorism Act]. They can use hugely powerful arrest powers before investigating.”

The British government plans to extend the detention without charge or trial period from 28 to 42 days.