Met Police Counter Terrorism Command confirmed they are investigating after five members of staff at HMP Whitemoor in Cambrideshire were attacked today. Scotland Yard said: "Due to certain circumstances relating to this incident, it was deemed appropriate for the investigation to be carried out by officers from the Met Police Counter Terrorism Command. "However, we must stress that at this early stage of the investigation we are keeping an open mind with regards to any motives and enquiries to establish the full circumstances of the incident are ongoing."
The BBC’s Home Affairs correspondent said the two prisoners were wearing fake suicide vests.
He wrote on Twitter: “Latest on the incident at HMP Whitemoor: The two prisoners involved in the incident were wearing fake suicide vests, BBC News has learned.
“They were carrying improvised, bladed weapons.
“Incident occurred this morning as prisoners’ cells were being unlocked. One prison officer appeared to be the initial target of the attack.
Met Police Counter Terrorism Command are investigating an incident
“The officer was stabbed and slashed. Other officers rushed to help their colleague.”
A Prison Service spokesperson told Express.co.uk: “Five members of staff at HMP Whitemoor attended hospital following a serious assault on an officer by two prisoners on 9 January.
"The incident was quickly resolved by our brave staff and our thoughts are with the injured officers at this time.
“We do not tolerate assaults on our hardworking officers and will push for the strongest possible punishment. We have referred the incident to the police and it would be inappropriate to comment further at this time.”
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The attack took place at HMP Whitemoor in Cambridgeshire
A prison source said the attackers shouted "Allah Akbar" as they slashed at officers with an "improvised weapon".
They told the Daily Express: "It was over quite quickly. It was horrendous for the five officers injured, particularly the one who was injured quite seriously.
"Counter-terrorism police are investigating because of the people involved and some of the phrases that were used.
"It was a contained incident. They are not life-threatening injuries. They have blade injuries, they were slashed with an improvised weapon."
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HMP Whitemoor in Cambridgeshire is one of the eight high security prisons in the country.
No arrests have yet been made.
HMP Whitemoor is one of the eight high security prisons in the country.
The prison also has a 458-capacity.
The last inspection of the prison by the HM Inspectorate of Prisons was conducted in July, 2017.
Five members of staff at HMP Whitemoor attended hospital following a serious assault on an officer
The inspection found the prison was generally safe and a decent high-security prison.
However, there were some concerns over segregation, according to Cambridgeshire Live.
HMP Whitemoor is a Category A men's prison.
A Category A prison is defined as "Those who escape would be highly dangerous to the public or national security", according to doingtime.co.uk.
The nature of the injuries to the officers is not yet known.
Category A prisons are segregated into Standard Risk, High Risk and Exceptional Risk.
This is based on their likelihood of escaping.
A member of the national executive committee of the Prison Officers Association (POA), Jackie Marshall, told Cambridgeshire Live: “Yet another violent attack on our staff and violence is just getting higher and higher across the prison estate, it’s raising it through the roof.
"And the department don’t seem to know how to deal with it.”
Additional reporting by Michael Knowles, Home Affairs Correspondent at the Daily Express.