Speaking later Thursday in Brussels, May described the intelligence sharing relationship between the USA and Britain as "deep", but added that it was, "built on trust, and part of that trust is knowing that intelligence can be shared confidently".
"I will make clear to President Trump that intelligence that is shared between our law enforcement agencies must remain secure", she said, in reference to an escalating diplomatic row between the United Kingdom and the US.
But on Thursday the leaks continued, culminating in a New York Times article which included detailed forensic pictures of the crime scene outside the Manchester Arena, including the remains of the bag that Abedi used.
Britain's top counterterrorism officer, Mark Rowley, announced late on Thursday that the UK had resumed exchanging intelligence with the United States on the Manchester terror investigation following a string of leaks by U.S. officials to the media.
British media have reported that one of the eight people under arrest is Abedi's brother but police have not confirmed that.
Libya arrested Abedi's father Ramadan and younger brother Hashem, who was also born in Britain, a relative and security sources said on Wednesday.
One of those in custody is the bomber's older brother, 23-year-old Ismail Abedi, who was detained the day after the bombing. A spokesman said the brother was aware of Abedi's attack plan, and both belonged to ISIS. His father too had been a militia member before he'd made a decision to flee the country when an arrest warrant was issued against him.
He spent 25 years in Britain before returning to Libya in 2011 after Gaddafi was ousted and killed in the country's civil war. Might they have fled, once they realized that Abedi's name had entered the public domain, and that the British police and security services were therefore on the trail of the network?
Abdullah Muhsin Norris, 70, told Sky News that Abedi was ejected from his mosque in Moss Side two months ago after he had tried to hide in the mosque library to read religious books overnight.
British counter-terror officers have been conducting raids and making arrests in the wake of the concert bombing earlier this week that killed 22 people, including children.
Security forces rounded up more suspects Wednesday in the deadly Manchester concert blast and soldiers fanned out across the country to national landmarks as an on-edge Britain tried to thwart the possibility of additional attacks.
Others, including parents, were waiting in the foyer to pick up family and friends when the bomb went off.
The Dangerous Woman tour will resume on June 7 in France, with further dates in Portugal, Spain and Italy, reports Variety.
She added, "Our response to this violence must be to come closer together, to help each other, to love more, to sing louder and to live more kindly and generously than we did before". Premiere League soccer clubs Manchester City and Manchester United have jointly pledged £1M to an emergency fund to support the victims.
Queen Elizabeth II, meanwhile, visited Royal Manchester Children's Hospital to talk to some of the bombing victims, their families and the medical staff treating them.