UK Edition
The UK's most senior counter-terror officer has warned there will be "more arrests and more searches" after an area of Manchester was evacuated.
It comes as Theresa May announced the terror threat level has been reduced from critical, which means an attack is imminent, to severe, which means an attack is highly likely.
Mark Rowley has warned more raids will be taking place as police lifted a cordon in Moss Side where a large area was evacuated and a bomb disposal unit was sent.
A property was being searched in Boscombe Street as Greater Manchester Police attempt to close the net on the suspected terror network behind attacker Salman Abedi.
It follows fresh arrests and raids being carried out linked to Monday's suicide bombing.
Residents in around a dozen streets were told to stay indoors as armed officers and a forensics team investigated a house in Boscombe Street.
Nicholas Turner, a 20-year-old student who also works in the warehouse at the Manchester Arena, said police and the Army had been in the area since around 9am.
He said: "This morning we saw a couple of police down the road and within minutes there was a bomb disposal team. I asked them why all the streets were cordoned off because I need to get to work.
"They told me to go back to the house and stay indoors. I saw them going into a house on Boscombe Street with those sort of baskets you'd bring your cat to the vet in.
"I've not seen anything come out. I actually work at the Arena although I wasn't in that day. A lot of properties have been searched around here. It's all a bit close for comfort."
Streets around Yew Tree Road were also evacuated and cordoned off.
Tim Wilcox, who also lives on Horton Road, said a friend of his who lives in Boscombe Street told him houses there had been evacuated.
The 57-year-old said: "My friend was leaving anyway but he was told to possibly expect not to get back in later. "I don't recall anyone ever coming or going from that house but I could be wrong."
Yamma Wu, 29, said she had been ordered not to leave her house by officers.
"I can see police cars outside the street and they are not allowing people out or in and there is an evacuation in this area, but because I have got a little baby with me they told me I could say inside, but I could not go out," she said.
Police used a controlled explosion in a raid in Cheetham Hill overnight in which two men were arrested.
Streets evacuated at the moment include Yew Tree Road, Thornton Road, Horton Road closed and Boscombe Street.
Harriet Cutchie, 24, who lives on the street, said her neighbour saw a man being taken out at around 6.30am.
"I got told my one of our neighbours that she got woken up at 6.30am this morning by shouts of 'police, police!'
"And then she saw a man being taken out. We got told to stay inside until further notice."
Officers were said to have been taking precautionary measures to ensure public safety.
The bomb disposal lorry left Yew Tree Road and the cordon was lifted shortly before 12.30pm with residents filing into the streets.
Two men aged 20 and 22 have been held on suspicion of terror offences after officers used an explosive device to gain entry to a property in the Cheetham Hill area of the city.
The development came as a vast security operation gets under way to protect hundreds of spring bank holiday events across Britain this weekend.
The public are being urged to carry on with planned activities against a background of heightened security fears.
Operation Temperer, which allows the military to be deployed to key sites, will continue until the end of the bank holiday, the Prime Minister said.
Troops will be gradually withdrawn from the streets from Monday onwards, having been drafted in to bolster police numbers, the Prime Minister said.
Speaking after a meeting of the government's Cobra emergency committee, the prime Minister said the decision had been taken after "a significant amount of police activity" over the last 24 hours.
She said: "The public should be clear about what this means - a threat level of severe means an attack is highly likely. The country should remain vigilant."
The massacre, in which 22 people were killed, was the worst terrorist atrocity to hit Britain since the July 7 attacks in London in 2005.
Latest figures from NHS England show that 63 people injured in the blast are still being treated in hospital with 20 in critical care.
Ariana Grande has announced she will return to Manchester to play a benefit gig for the victims of the attack.