Brits continued to watch him.

Via The Daily Mail:

UK security chiefs were warned in January that Salman Abedi was planning an attack in Britain, it was claimed last night.

According to a security source, the FBI told MI5 that Abedi was part of a North African Islamic State cell plotting to strike a political target in the UK.

The information came from a US investigation into Abedi and his links to terrorist groups in Libya. The Mail on Sunday has also been told that US security services put him on a terror watch list – used by agents to identify key suspects – in 2016.

The shocking claim piles further pressure on MI5 to reveal when and how it became aware of Abedi, and why UK spies decided he did not pose a significant threat to British security.

The source told The Mail on Sunday: ‘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.

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