Buildings at Manchester University were evacuated on Wednesday after highly explosive chemicals had crystallised when a researcher's experiment went wrong.
A bomb disposal squad was called to a chemistry lab in the Parisier Building around 11.30am following concerns acetone peroxide had crystallised, making the substance volatile and extremely unstable.
The emergency services were alerted by a staff member who raised concerns about how the chemical was being stored, according to Manchester Evening News.
Police are now investigating why the experiment was being conducted in the first place and whether the necessary precautions had been taken.
The chemical convoy from the Manchester University incident heads to a secure location for a controlled explosion. pic.twitter.com/puUTP8DavZ— Michelle Livesey (@liveseybinks) March 4, 2015
Road closures in place around Sackville Street have now been lifted. GMP would like to thank the public for their cooperation.— G M Police (@gmpolice) March 4, 2015
The University would like to thank all staff and students for their patience during today's enforced closures— Uni of Manchester (@OfficialUoM) March 4, 2015
No-one was injured and the buildings are now open as normal.