The FBI warned Britain's MI5 in January that Manchester bomber Salman Abedi was part of a North African ISIS cell that was plotting an attack against a target in the United Kingdom, the Daily Mail reported.
The information came from a U.S. investigation into Abedi and his links to various terrorist groups in northern Africa. He was eventually put on a terrorist watch list by U.S. authorities.
"In early 2017 the FBI told MI5 that Abedi belonged to a North African terror gang based in Manchester, which was looking for a political target in this country," an anonymous source told the Daily Mail.
"The information came from the interception of his communications by U.S. federal agents, who had been investigating Abedi since the middle of 2016, and from information unearthed in Libya, where his family was linked to terrorist groups"