There were prayers for the victims at church services across Manchester on Sunday.
Hundreds of soldiers have been sent to replace police at high-profile sites including Buckingham Palace and Parliament, and police armed with submachine guns are being deployed in city centers, transit hubs, tourist areas and major events.
British police working on the case have resumed intelligence-sharing with USA counterparts after a brief halt because of anger over leaks to US media thought by Britain to be coming from USA officials.
Fresh arrests have been made connected to the Manchester suicide attack as police continue to hunt down Salman Abedi's suspected accomplices.
Seven other men are in custody in connection with Monday's blast, with police and security agencies working to prevent further attacks.
As of May 27, Millsaps letter has been retweeted 26,000 times including country singer Taylor Swift and Miley Ray Cyrus who dedicated her Billboard Music Awards performance to the victims of the attack.
Police have released a photograph of Salman Abedi on the night of the Manchester terror attack, taken from CCTV footage.
Hopkins and Basu said they had gathered significant information about Abedi, a 22-year-old Briton born to Libyan parents, how his bomb was built, his associates, finances, the places he had been and the wider conspiracy.
Northern rail said Friday that Manchester Victoria Station "suffered structural damage that still needs to be properly assessed and repaired".
In terms of intelligence sharing, a majority, 70 per cent, think it is right that Britain shares her counter-terrorism information with the U.S., Canada, Australia, and New Zealand (known as the Five Eyes).
Speaking to reporters outside the mosque, El-Khayat said, "We do not radicalize people".
A matter of hours after he was captured on camera, the 22-year-old was dead, having inflicted an outrage on a pop concert attended predominantly by young girls.
GMP said officers made the latest arrests as they executed a warrant at an address in Cheetham Hill, north of the city centre.
He said it had to happen in order not to hand a victory to terrorists.
A threat level of severe means an attack is highly likely.
The 23-year-old then revealed she will be "returning to the incredibly fearless city of Manchester to spend time with my fans and to have a benefit concert in honor or the victims and their families".
He said fans coming to football and rugby matches this weekend should come earlier than usual because of added security screening. Their ages ranged from 18 to 38.
Williams said "covert and discrete tactics" will also be employed to protect the transport network.
Greater Manchester Police said two men, aged 20 and 22, were detained early Saturday in the northwest England city on suspicion of terrorism offenses.
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