Amy Cole
at Birmingham Crown Court

The court was shown these videos, which were sent to a friend on Snapchat.

Strang sent more images and video, among them of the person responsible for a massacre in Crimea and of Norwegian domestic terrorist Anders Breivik.

Amy Cole
at Birmingham Crown Court

The court hears that Strang sent three videos on Snapchat to a fellow student showing him lighting substances in his garden.

Prosecutor Matthew Brook also referred to messages or images he sent about killers, including Jeffrey Dahmer and the perpetrator in the Sandy Hook massacre.

He also sent further communications about bomb-making, Brook added.

On 10 September, three students raised concerns with their course leader, and the college made the decision to cancel its woodwork classes for that afternoon.

His property was then searched by police, who found documents created by Strang written earlier in the year, which described his plans to do "something big, something violent".

He said he had hatred for "everything" and the document also stated he had considered a knife attack at a hospital where his father was being treated.

Strang also expressed a desire to be like other high-profile serial killers.

Birmingham Crown Court is hearing how that during a break from his woodwork class on 9 September, at about 14.15 BST, students went outside to a park area and Strang was asked about his interests.

He told his fellow students that he "idolised serial killers". He also asked if he could be lent a pressure cooker, so he could "blow up college", the court was told.

Strang told students he had timed the relevant exit routes to allow him enough time to get out of the building safely.

Prosecutor Matthew Brook KC has started to address the court.

He said Strang had been living in the South Africa but move to the UK, and had been living there for three and a half years with his parents at the time of the offences.

A witness described him as being a “nice kid” in South Africa but said he had “completely changed” since being in England.

He started a diploma in woodwork at Stafford College last year. Brook added.

The hearing, at Birmingham Crown Court is just beginning.

Police said Strang's mobile was also examined and officers discovered "concerning material", including a manifesto and internet searches relating to mass killers.

Speaking after the guilty pleas, Det Insp Dave Rowlands described it as "a deeply concerning case".

Staffordshire Police said officers first became aware of Strang when they were contacted by a safeguarding officer at Stafford College in September.

It was reported that Strang, who was studying at the college, told other students he had numerous weapons and was planning to blow up the site, according to the force.

He was arrested at his home the same day, while officers undertook a search of the property.

Image source, Staffordshire Police

Strang had been due to stand trial in May but changed his pleas to guilty just before the case was due to start.

The hearing was told he admitted making the threats, but they were on the basis that he had no intention to build a bomb.

He also pleading guilty to possessing explosive substances, including gunpowder and thermite, and accessing instructions about how to make black powder and an improvised detonator.

Image source, Staffordshire Police

Jagger Strang, 18, Is being sentenced this afternoon after admitting threatening to bomb his college.

Explosives were found by police at his home, in Stafford, while Strang also admitted accessing material on YouTube about the manufacture of black powder and how to make a detonator.