The father of Manchester suicide-bomber Salman Abedi was arrested by counter-terrorism forces in Tripoli, Libya, Reuters reported on Wednesday. Abedi was identified on Tuesday as the bomber who attacked attendees exiting an Ariana Grande concert in Manchester, U.K., killing 22 people—many of them young girls—and injuring dozens more. Officials have said it is “likely” Abedi did not act alone. His brother, Ismail Abedi, was arrested earlier this week. Another brother, Hashem Abedi, was also arrested in Tripoli under suspicion of Islamic State ties. At least five people have been arrested in Manchester related to the bombing. The Islamic State terror group claimed responsibility for the attack, but analysts have yet to confirm that involvement.