tripoli libyan authorities process request britain extradite brother bomber kill 22 people manchester may decision take yet government spokesman say thursday arm group hold brother say attorney general office agree request force would ready next step salman abedi 22-year-old briton bear libyan parent blow end show u.s. singer ariana grande deadly militant attack britain 12 years victims include seven children 500 people injure wednesday british police say issue arrest warrant brother hashem abedi murder attempt murder conspiracy cause explosion prosecutors ask libya extradite official request receive libyan ministry foreign affairs libyan authorities cooperate process request accordance libyan legal procedures say hassan al-houni spokesman internationally recognize government tripoli decision take yet days attack special deterrence force rada counter-terrorism anti-crime group align government arrest hashem abedi brothers father ramadan father release august various arm factions tripoli align government semi-official status law enforcement however government struggle impose authority limit power rada initially say would extradite hashem say ready cooperate agreement attorney general british authorities ready next step spokesman ahmad ben salim say libyan attorney general office could reach comment islamic state say responsible immediate aftermath bomb security service always treat claim scepticism june rada say hashem abedi tell brother radicalised britain 2015. fly britain libya april hashem say help buy equipment necessary attack although know salman plan bomb rada say british police say salman abedi return manchester may 18 four days attack family emigrate britain rule late libyan leader muammar gaddafi brothers parent return libya 2011 revolution police previously say believe salman abedi build bomb cctv show buy nut hardware store use shrapnel well tin believe contain explosives libya consider uk extradition request manchester bomber 's brother