A Russian student has admitted making an explosive substance after bomb alerts led to buildings being evacuated in Newcastle city centre.
Vladimir Aust, 18, was arrested in London after the evacuation in June of a bus station and a language school at Newcastle University, where he studied.
A controlled explosion was carried out on a recovered substance.
Aust of Haymarket Lane, Newcastle, who appeared in court via videolink, will be sentenced next month.
The charge related to making hexamethylene triperoxide diamine (HMTD) – often used in the mining industry – at some point between 1 September 2013 and 11 June 2014, Newcastle Crown Court heard.
A charge of carrying two knives near the Russian embassy in London was dropped by the prosecution.
Aust was initially arrested under anti-terrorism provisions, but the court was told those no longer applied.
The two separate alerts in June caused disruption in Newcastle city centre, with the bus station and part of the university being evacuated.
Bomb disposal officers used a robot to search the university’s INTO language building.
A second 18-year-old Russian student, also arrested in connection with the alerts, remains on police bail pending further inquiries.
Newcastle University caters for more than 22,000 UK and international students and has 1,200 academic staff.