As Threat Level Lowered, Manchester Holds First Big Event Since Monday's Attack

Meanwhile in Britain, British police said they had arrested a seventh person following searches at an address in Nuneaton, central England.

Greater Manchester Police officials hope to resume normal intelligence relationships with the USA soon, the report added, but they are now "furious" about recent leaks - suspected to have been made by American law enforcement.

Police scrambled to close down a network around the Manchester suicide bomber with arrests in Britain and Tripoli on Wednesday, as details about the investigation were leaked to USA media, infuriating authorities who fear a second attack is imminent.

A militia in Libya has detained Abedi's father and brother.

US media outlets have been reporting details about the attack that British officials hadn't wanted to share yet, to help in their investigation.

On Wednesday, The New York Times posted photos that show what it said could be the detonator, a battery, nuts and screws for shrapnel, and fragments of a backpack used in the attack.

British Prime Minister Theresa May is expected to express her country's concerns about the matter to President Donald Trump at a North Atlantic Treaty Organisation meeting on Thursday in Belgium, according to multiple published reports.

Salman Abedi, a British man of Libyan descent, reportedly spent three weeks in Libya before the attack-returning to the United Kingdom just days before detonating an explosive at an Ariana Grande concert at Manchester Arena.

The club dedicated their trophy to those killed, while manager Jose Mourinho said they would gladly exchange it if it could bring their lives back.

The official Twitter account of the Manchester Evening News tweeted to say that online fashion retailer - which has its head office close to the site of the attack - has donated £100,000 to the campaign. Another brother and Abedi's father have been detained in Libya.

Yvette Cooper said she was very troubled by the leaks amidst a "live investigation where public safety at risk", while Lilian Greenwood asked, "What is the Government doing with USA counterparts to address these breaches?"

Among those in custody is Abedi's brother Ismail, who was arrested in Whalley Range, south Manchester, on Tuesday.

Britain's terror threat assessment has been hiked to "critical", the highest level, meaning an attack is considered imminent.

She was welcomed by her boyfriend, the rapper Mac Miller, before heading to her home, media reports said.

The bombing was the latest in a series of IS-claimed attacks in Europe that have coincided with a US-led offensive against the jihadist group in Syria and Iraq.

The government is "furious" over a string of leaks of details about the investigation, Sky news said.

"Abedi was one of a larger pool of former SOIs whose risk remained subject to review by MI5 and its partners", he said.

In the early hours of Thursday morning, counter-terror police carried out a controlled explosion at a property in the Moss Side area of Manchester, although no arrests were reported by police. Troops have been deployed to free up police officers for patrols and investigations.

The bombing occurred just over two weeks before a snap general election set for June 8 for which campaigning is set to resume in earnest on Friday after being suspended in the wake of the attack. "If we gave up information that has interfered in any way with their investigation because it tipped off people in Britain - perhaps associates of this person that we identified as the bomber - then that's a real problem and they have every right to be furious".