THE suspect arrested over a terror attack in Reading's Forbury Gardens that left three dead is understood to have been named as Khairi Saadallah.

Thames Valley Police confirmed that a 25-year-old from Reading has been arrested on suspicion of murder following the multiple stabbing yesterday (June 20).

He remains in custody.

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The man arrested has been named as Khairi Saadallah, according to the Telegraph and a number of other national news outlets.

Reports state he is believed to be a Libyan asylum seeker, who briefly came to the attention of MI5 last year.

Former head of UK counter terrorism Sir Mark Rowley told Today that police and security services face a "wicked problem" deciding which of the 40,000 people known to them could launch a terror attack.

Security Minister James Brokenshire told BBC Breakfast that 25 attempted terrorist attacks had been prevented over the last three years and there was no indication of a change to the UK's threat level.