LONDON - The brother of a man who detonated a suicide bomb after an Ariana Grande concert in Britain in 2017 denied on Friday attempting to murder three prison guards in jail where he is serving a life sentence.

Prosecutors say Hashem Abedi, whose brother Salman Abedi killed 22 people at the Manchester Arena in northern England in 2017, attacked four prison officers with hot cooking oil and makeshift knives while shouting "Allahu Akbar".