Bomb disposal experts were called to a university campus after a student 's experiment went wrong , creating a chemical that is 'highly volatile ' and at risk of causing a huge explosion . Students had to be evacuated and emergency services called after concerns were raised about a sample of a acetone peroxide - a highly dangerous chemical often used in improvised attacks by terrorists - being accidentally turned into an explosive form at a Manchester University laboratory . The incident came just hours after a student was injured after a chemical explosion at a Liverpool University lab , which was so forceful it blew off the doors and broke windows . Emergency services : Students had to be evacuated after concerns were raised about a sample of a acetone peroxide being accidentally turned into an explosive form at a Manchester University laboratory ( above ) On the scene : Army bomb disposal experts and the emergency services were called to a chemistry lab in the Pariser Building shortly at Manchester University before 11.30am today . Danger : The emergency services were called after concerns were reported to police that acetone peroxide had become 'crystalised ' during an experiment in a lab , making it volatile . Army bomb disposal experts and the emergency services were called to a chemistry lab in the Pariser Building shortly at Manchester University before 11.30am today . They were called after concerns were reported to police that acetone peroxide had become 'crystalised ' during an experiment in a lab , making it volatile . Acetone peroxide is a highly explosive chemical made by mixing acetone , hydrogen peroxide and acid . It is extremely unstable and can explode due to mild heating or shock . It has become popular amongst terrorists and has been used in a number of improvised attacks . After emergency services were alerted the building on Sackville Street and other nearby university buildings were evacuated . Sackville Street , Whitworth Street , Princess Street and a slip-road of the Mancunian Way were closed as the police and emergency services cleared the area . Merseyside Fire and Rescue arrived at the scene in Liverpool this morning and rescued the PhD student . Paramedics arrived at the Liverpool site with the fire crews and the man was given first aid at the scene . A firefighter ( left ) creates a cordon while a member of Liverpool University staff ( right ) looks on . Police are investigating why the experiment was being carried out and what precautions had been taken . A university worker , who declined to be named , told the MEN : 'From what I 've been told , they were mixing two chemicals together and it crystalised and became a threat . 'At least a couple of hundred people staff and students have been evacuated . We 're just waiting for the Army bomb disposal squad to arrive . 'In our office in the George Begg building the we did n't know what was happening at first . Then university security came in and evacuated all the building . ' A Manchester University spokesman said : 'The university 's Pariser Building on Sackville Street was evacuated this morning after a chemical crystallised and became unstable . 'The police and fire service were called and a major incident has been declared . 'Two neighbouring buildings have been evacuated on the advice of the emergency services . We are working closely with the police and fire service who remain in charge at the scene . ' Greater Manchester Fire and Rescue Service urged people to avoid the area but stressed the situation was 'stable at the moment ' . Firefighters were called to help the man at the University of Liverpool and helped give him first aid . Liverpool University has said it is investigating the cause of the explosion which has not yet been disclosed . A spokesman said : 'There is an evacuation of the building and surrounding buildings as well as road closures . We have a 150m cordon in place and the Army bomb disposal squad have been called to assists us . ' I would stress that the situation is stable at the moment . However , it would be helpful of people and traffic would avoid the area . ' Police and firefighters remained at the scene to assess the risk to the public . Just hours earlier a male PhD student had to be rescued at Liverpool University after an explosion in a laboratory . The student had to be rescued from the fourth floor of the university building at about 8.45am . Crews raced to the University 's Oxford Street campus to deal with the blast which blew a door of its hinges and shattered windows . Area manager Nick Searle , from Merseyside Fire and Rescue , said : 'Firefighters were called to the fourth floor of the building and a man at the scene was given first aid by firefighters . 'We were called after a small explosion involving a chemical at the site . 'Firefighters are liaising with staff on site and are stood by with dry powder extinguishers and a hose . Paramedics were also requested to check the man who was given first aid . ' A University of Liverpool spokesman said they were investigating how the incident took place .
Bomb disposal experts were summoned to Manchester University this morning . Team called in over fears highly volatile chemical accidentally created . hydrogen peroxide is believed to have crystalised , reducing explosion risk . Chemical is extremely unstable and is used in improvised terrorist attacks . an earlier victim was injured in an explosion at Liverpool University . The blast was so forceful it blew out windows and blew off their hinges .