At least six people have died in protest-related violence as supporters seeking Imran Khan’s release from prison broke through barriers meant to lock down Islamabad.

Thousands of opposition protesters have converged on Pakistan's heavily-barricaded capital, demanding the release of jailed former prime minister Imran Khan.

Police in Islamabad fired tear gas and rubber bullets at protesters demanding the release of former Pakistani Prime Minister Imran Khan. The government said four security personnel were killed amid the unrest.