At an Ariana concert at the MEN Arena in Manchester on Monday night, 22 people were killed and 59 injured when a nail bomb was detonated in the foyer by 22-year-old Salman Abedi.
On Wednesday morning, Manchester police arrested three men in the south of the city in connection with the bombing, taking the total number of suspects in custody in the United Kingdom to four.
Abedi, who was reportedly born in the U.K.to Libyan parents, is believed to have recently traveled to Libya, according to multiple media outlets that cite US officials with knowledge of the investigation. An initial deployment of 984 had been ordered, first in London and then elsewhere.
Almost 3,800 soldiers have been on Britain's streets, taking on guard duties at sites such as Buckingham Palace and Downing Street to free up police to focus on patrols and investigation, Rudd told the BBC. She stopped short of suggesting the U.S. leaks compromised the investigation.
Amber Rudd told public broadcaster the BBC on Wednesday that suspected suicide bomber Salem Abedi, a 22-year-old Briton, had been known to security services "up to a point". As of Wednesday morning, police say, they've identified all victims who lost their lives and contacted all of the families involved. He added that the victims will be formally identified by a coroner in the next four or five days.
Manchester officials raised to 119 the number of people who sought medical treatment after Monday night's attack, saying 20 of them had critical injuries. Rudd said that it was "likely, possible, that he wasn't doing this on his own".
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"If anyone comes across my parents please, please let me know as they've been missing ever since the attack, this is a picture taken tonight so this is exactly what they were wearing", she wrote.
The BBC reported that the security services thought Abedi may have been a "mule" for a bomb made by someone else, because they thought the device was too sophisticated for him to have put together by himself.
Officials are examining Abedi's trips to Libya as they piece together his allegiances and try to foil any new potential threats.
"In any case, the links with Daesh are proven", he said, using a term for the Islamic State group.
Islamic State, now being driven from territories in Syria and Iraq by Western-backed armed forces, claimed responsibility for the Manchester attack, but there were contradictions in its accounts of the action and a telling lack of detail.
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Theresa May's Conservatives have said that they will follow suit in what is being described as a "phased" return to campaigning.
The government Tuesday night raised the threat to "critical", its highest level, following an emergency Cabinet session. All campaigning was suspended after the attack, although the UK Independence Party said it would resume its activities on Thursday.
Abedi was born in Britain, grew up in Manchester's southern suburbs and attended the local Salford University for a time.
Rudd has refused to respond to Collomb's comments that Abedi was believed to have been to Syria, in an interview with Sky News.
"Yes, quite frankly. I mean the British police have been very clear that they want to control the flow of information in order to protect operational integrity, the element of surprise, so it is irritating if it gets released from other sources and I have been very clear with our friends that should not happen again".
"I have been very clear with our friends that should not happen again", Rudd said.
"I think it's very clear this is a network we are investigating", he said, adding that an off-duty police officer was among those killed in concert attack.
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