ISLAMABAD — Supporters seeking the release of imprisoned Pakistani former premier Imran Khan on Tuesday broke through a ring of shipping containers locking down the capital Islamabad, while at least six people have died in protest-related violence. Protesters battled security forces and ignored a government threat to respond with gunfire. [time-brightcove not-tgx=”true”] The dead included four members of the security services and one civilian who were killed when a vehicle rammed them on a street.