Manchester police made four new arrests and searched an address in the city center.
Manchester police Chief Ian Hopkins said the story and photographs were "distressing" to victims' families. "But I can say that they are perfectly clear about the situation and that it shouldn't happen again".
The threat level was raised to its highest level after suicide bomber Salman Abedi killed 22 people at the concert Monday night at Manchester Arena. Another brother and the suspect's father were arrested in Libya, witnesses and security forces said.
"In any case, the links with Daesh are proven", Collomb said, using another term for the Islamic State group.
A man arrested on Tuesday was reported by British and USA media to be Abedi's other brother.
British interior minister Amber Rudd told BBC radio Wednesday it was "likely, possible" that the bomber "wasn't doing this on his own". "He saw the explosives America drops on children in Syria, and he wanted revenge", she said.
Despite claiming the information was highly sensitive and could put lives at risk, officials continued to leak parts of what Trump had allegedly told the Russians to other outlets over the next few days.
Many European cities, including Paris, Berlin and Brussels, have suffered attacks in the last two years, underlining the importance of confidential intelligence cooperation.
Overnight, the families of 15-year-old Olivia Campbell and 32-year-old Kelly Brewster confirmed they had both died in the attack. The announcement follows U.K. Prime Minister Theresa May's decision to raise the threat level of the country to critical, meaning another attack could be imminent.
In addition to those killed in the concert bombing, Manchester officials raised to 119 the number of people who sought medical treatment after the attack, 20 of them with critical injuries.
British Army soldiers are led by a police officer into Buckingham Palace in central London on May 24, 2017.
The elder Abedi has been appointed administrative manager of Tripoli Central Security forces, which answers to the United Nations -backed government. "He was angry", a neighbor of Abedi told The New York Times of his reaction to the anti-extremist sermon.
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Investigators were trying to piece together the last movements of suicide bomber Salman Abedi, a Manchester-born university dropout whose parents had reportedly fled the now fallen regime of Libyan dictator Moamer Kadhafi.
Greater Manchester Police said earlier two men were arrested overnight in Manchester and in the Withington area in the south of the city.
"When arrested, the man was carrying a package which we are now assessing".
British police say officers and the army are responding to an incident at a college in Trafford, a district near Manchester.
Nell Jones attended the Ariana Grande concert with her friend.
The Chelsea soccer team announced it would cancel Sunday's victory parade in London that was to have celebrated the team's Premier League title win this season.
Britain also has a national election scheduled for June 8. The force said it was too early to say whether the alert is linked to its investigation into the Manchester bomb attack.
The government said a minute's silence would be held at all official buildings at 1000 GMT (6.00 a.m. ET) on Thursday.
A woman who was arrested in Blackley on Wednesday evening has since been released without charge.
As more of the victims are identified - more armed soldiers are put on patrol across Britain.
Authorities say 22 people died and almost 120 were wounded in the bombing.