Staffordshire Police will be investigated for it's role in the management of London Bridge attacker Usman Khan following his release from prison, say the police watchdog.
The Independent Office for Police Conduct (IOPC) will conduct a separate investigation into the police force after receiving further information.
The investigation is at an early stage and it will look at Staffordshire Police contact with Usman Khan prior to his death.
He was believed to have been living at a home in Stafford before he stabbed two people to death on London Bridge on November 29.
Khan, who was armed with two knives and wearing a fake suicide vest, was tackled by members of the public, including ex-offenders from the conference, before he was shot dead by police.
It later emerged that Khan was released from prison on licence in December 2018, halfway through a 16-year prison sentence, after he was convicted of terror offences in February 2012.
An investigation began immediately after the incident, examines the circumstances of the shooting and the actions and decisions including the use of lethal force, of the officers involved in the police response.
The IOPC has a duty to investigate fatal police shootings and they have said that no individual police officers are under investigation.
All officers involved are being treated as witnesses.