london british police say wednesday issue arrest warrant brother suicide bomber kill 22 people attack pop concert manchester may prosecutors ask libya extradite 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 among victims 500 injure assistant chief constable russ jackson responsible counter-terrorism northwest england say police apply grant arrest warrant abedi young brother hashem murder attempt murder conspiracy cause explosion hashem abedi currently detain libya cps crown prosecution service request libyan authorities consider extradition back unite kingdom jackson say grateful libyan authorities consider request add detectives find evidence involvement wide network islamic state say responsible immediate aftermath bomb security service always treat claim scepticism days attack libyan counter-terrorism investigators arrest hashem abedi brothers father ramadan june special deterrence force rada counter-terrorism force align u.n.-backed government tripoli 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 move london fallowfield area south manchester live decade brothers parent return libya country 2011 revolution jackson say investigation still run fast pace inquiry involve trawl 16,000 hours close circuit tv cctv footage million line telephone communications data police previously say believe salman abedi build bomb cctv show buy nut hardware store use shrapnel well tin believe contain explosives uk seek arrest manchester bomber 's brother ask libya extradite