A former pupil of a High Wycombe grammar school, who is believed to have joined ISIS and whose name featured on a list of jihadists held by Turkish authorities, reportedly said “there’s so many brothers just waiting for the order to do attacks on the west”.

Shabazz Suleman left Wycombe’s prestigious Royal Grammar School [RGS] in May when he went on examination leave for his A Levels.

In October, the Bucks Free Press revealed that anti-terrorism officers were due to visit RGS following concerns that the former pupil, who was described by the headteacher as being an “engaging and amiable” student, may have joined ISIS.

Days later his name appeared on a list of 180 ISIS hostages being held by Turkish authorities in exchange for 49 of their diplomats.

In an interview with The Times this week, the 19-year-old reportedly said: “I had the option to get deported and not be linked to IS or be part of the exchange.”

Suleman said he was visited twice by MIT, the Turkish intelligence agency, after his parents reported him missing to the British police and Turkish authorities.

Suleman describes the moment he was captured by the Turkish authorities in the interview.

“They caught me at the border,” Suleman said.

“I went the wrong way. Straight into the hands of the Turks. Was beaten a bit nothing much lol. Then took us to hospital for check up. I was fine anyhow. Was questioned by Turkish military intel, fined and was told [I] was to be deported. Had a good cover story convinced some of them that I was an aid worker, did aid work last year lol.”

Suleman described being held by Turkish police with about 35 other ISIS jihadists, mostly Chechens, in open conditions in a “prison” in Sanliurfa, an hour’s drive from the Syrian border.

He also boasted about the luxuries that were made available to him during his incarceration, such as pizza and videos.

“Cops were very friendly,” he said. “Understood why we wanted to fight in Syria. They hated Assad, Israel etc. Their ideology was that of the Muslim brotherhood,” he added.

“It was good lol. Had pizza in prison. Dominoes lol. Was allowed net. We spoke to dawla [ISIS] in prison. Watched ISIS videos. Sang nasheeds [Islamic chants].”

The teenager added that he had wanted to study international relations and join the United Nations, and had been set to start at Keele University, before being radicalised by “jihadi scholars” he met on Twitter while following the conflict in Syria.