Seven people have been arrested in relation to the suicide bomb attack on young people in the UK city of Manchester on Monday night.
This follows an announcement that the UK terror threat level is now at a “critical” level, indicating that more attacks may be imminent.
Salman Abedi killed 22 people and injured 64 outside a music concert at the Manchester arena, in the heart of the city.
Five people were arrested in the UK, one of them the suicide bomber’s elder brother Ismail, while his father Ramadan and younger brother, Hashem, were arrested in Libya.
Reuters reported that Hashem, 20, was arrested in the capital Tripoli on suspicion of links with Islamic State.
Investigations are ongoing to unravel whether Salman was working in a terrorist network or acted on his own.
Meanwhile, armed military officials have been deployed to guard key locations across London and embassies.
Security remains tight in Manchester and nearby towns, including major cities across the UK.