benghazi libya senior figure across libya political divide protest thursday remark british foreign secretary boris johnson clear dead body city sirte johnson tell members conservative party tuesday british investors brilliant vision turn sirte former stronghold islamic state next dubai body could clear away lawmakers libya house representatives hor represent political military factions base east country call comment unacceptable hor foreign affairs committee issue statement demand clarification british prime minister apology libyan people head libya u.n.- western-backed government base tripoli spurn hor also ask clarification meet british ambassador capital say johnson statement unacceptable say statement fayez seraj head u.n.-backed government johnson comment lead call resignation british political opponents accuse play politics say twitter refer clear booby-trapped body islamic state militants local libyan force back u.s. air strike fight six months last year oust militants sirte islamic state turn important base outside middle east coastal city 80,000 badly damage campaign struggle rebuild hor base eastern libya since 2014 conflict tripoli lead set rival parliaments governments capital east cooperation consider crucial progress new u.n. plan stabilize libya end turmoil begin nato-backed uprise topple muammar gaddafi 2011. libyan side call boris johnson 's body remark 'unacceptable