UK park stabbing suspect 'known to MI5
The person held on suspicion of killing three persons at a park in Reading was recognized to MI5, security sources say.
Khairi Saadallah, 25, from the town, was arrested on Saturday and law enforcement say they are not looking for anybody else over the terror incident.
Options told the BBC he's actually from Libya and found the focus of MI5 in 2019.
One victim has been named as teacher James Furlong - described simply by his family as "a wonderful man".
Paying out tribute to Mr Furlong, 36, head of history, authorities and politics at The Holt School in Wokingham, his parents Gary and Janet said: "He was beautiful, smart, honest and fun."
PM Boris Johnson said he was "appalled and sickened" by the strike in Forbury Gardens on Saturday night time.
Counter Terrorism Policing South East (CTSPE) said a 25-year-old man from Studying, who was arrested primarily on suspicion of murder on Saturday, has now been re-arrested under Section 41 of the Terrorism Act 2000.
Security options said the suspect found the focus of the security providers after they received information he previously aspirations to travel overseas - potentially for terrorism, in line with the BBC's residence affairs correspondent Dominic Casciani.
When the info was further investigated, mainly because the initially stage of looking at a potential lead, not any genuine threat or immediate associated risk was identified.
No case data file was opened which could have built him a concentrate on for further investigation.
The Holt University said Mr Furlong was a "kind and gentle man" with a "real sense of duty".
In a statement, Anne Kennedy and Katie Pearce - co-head teachers of the secondary school for women - said Mr Furlong "truly inspired everyone he taught through his passion for his subject matter and his dedication".
"He was determined our students would create a critical awareness of global concerns and in doing so, become active residents and have a voice," they said.
Mr Johnson has promised actions following a incident "if there are lessons that we should try to learn".
Metropolitan Law enforcement Assistant Commissioner Neil Basu, head of counter-terrorism policing, described it as a great "atrocity" and said his "deepest sympathies visit the families who'll be mourning loved kinds after this horrific act".
Mr Basu said investigators are not looking for anybody else in connection with the attack.
Detective Chief Superintendent Kath Barnes, Head of CTPSE, said the investigation "continues to go at a fast pace".
The suspect was arrested within 5 minutes of the first emergency call designed to police, and several officers were quickly on the picture, she confirmed.
A pal of the suspect told the BBC's house affairs correspondent Daniel Sandford that Saadallah appeared to be a "regular, genuine guy", and had been someone with whom to smoke cannabis.
Kieran Vernon said: "He appeared like me or you. If we used to meet we used to discuss drinking whiskey and how numerous ganja influences the different thinking of mind.
"And that's virtually all we'd discuss."
A witness told the BBC he found a guy moving between teams of people in the park in Reading town centre, trying to stab them.
Three other persons were injured in the attack, which took place at about 19:00 BST on Saturday.
Two of the injured people have already been discharged and one remains to be in hospital, although the injuries aren't regarded as life-threatening.
Labour innovator Sir Keir Starmer has said that "folks are united within their grief" following the attack, and that he really wants to speak to the primary minister to go over how to "study from this."
"This is not a time for party politics," he said.
"It's incumbent on most of us to draw together in response to this on a cross party basis."
