TRIPOLI, May 24 (Xinhua) -- Libyan Special Deterrence Forces, also known as Rada, said on Wednesday that Hashem Abedi, the younger brother of the Manchester bomber, was planning to carry out a terrorist attack in the capital Tripoli.

Hashem was arrested in Tripoli on Tuesday when he was collecting 4,500 Libyan dinars (3,240 U.S. dollars) his brother Salman Abedi, the Manchester bomber, transferred to him to carry out a terrorist attack in Tripoli, the forces said on its Facebook page.

Hashem also admitted he and his brother belong to Islamic State (IS) group, the forces added.

Also on Wednesday, the forces arrested Ramadan Abedi, Salman's father, over suspicion of links to IS.

The British city of Manchester witnessed a bloody attack on a concert hall on Monday, which killed 22 and injured more than 100 others.