Pakistani authorities insist marchers calling for former PM to be released from jail will not reach the capital

Imran Khan’s supporters have begun a march to Islamabad to demand his release from jail after efforts by the government to halt the protest failed.

The march began in the former prime minister’s stronghold province of Khyber Pakhtunkhwa in north-west Pakistan on Sunday, according to leaders of his Pakistan Tehreek-e-Insaf (PTI) party.