(PA) -- Detectives were said to have a “greater understanding” of the way Salman Abedi built the device which detonated in a crowd of concert-goers on Monday.

A wave of arrests and raids are believed to have closed the net on the terror ring behind the attack, but counter-terror chief Mark Rowley warned “more arrests and more searches” could follow.

Prime Minister Theresa May announced on Saturday that troops will gradually be withdrawn from the streets from Monday onwards, having been drafted in to bolster police numbers.

The de-escalation in the country’s threat level from its highest point suggests confidence that the operations conducted in the last week have stifled any imminent threats.

Currently 11 people remain in police custody after a raid on an address in the Cheetham Hill area of Manchester saw a 20-year-old and a 22-year-old detained on suspicion of terror offences.

It came amid searches at a separate property in Cheetham Hill and an address in the Longsight area in south Manchester, while a road in Moss Side was evacuated by officers searching a home there.

Monday night’s massacre at the Manchester Arena left 22 dead, including seven children, and scores of others injured – the worst terrorist outrage to hit Britain since the July 7 attacks in 2005.
It led the JTAC to increase the terror threat level to “critical”, meaning a further terror attack was considered “imminent”. It has now been reduced to “severe”, meaning an attack is “highly likely”.