Image copyright AFP Image caption Hundreds of supporters of Nawaz Sharif gathered at the court in Islamabad for the verdict

Former Pakistani Prime Minister Nawaz Sharif has been sent back to jail after a fresh corruption conviction.

The anti-corruption court in Islamabad gave Sharif a seven-year term for investments beyond his declared assets.

Sharif, who denies wrongdoing, was jailed in July in a different corruption case but bailed on appeal when the Islamabad High Court suspended his 10-year sentence in September.

His party lost general elections in July while he was in jail.

Former cricketer Imran Khan's Pakistan Tehreek-i-Insaf (PTI) won most seats, after running on an anti-corruption platform.

Security around the court in Islamabad was tight for Monday's verdict.

The former ruling party - the Pakistan Muslim League-Nawaz - had threatened to start a mass protest movement and disrupt parliamentary business if its leader were sent back to prison.

Security personnel fired tear gas and baton charged his supporters outside the court.

Sharif has said the charges against him are politically motivated and is expected to appeal against his latest conviction.

The accountability court said he could not prove the source of income for ownership of al-Azizia steel mill in Saudi Arabia.

In addition to his prison term he was fined $25m.

It acquitted him in a second case, Flagship Investment, in the UK for lack of evidence.

His two sons, Hassan and Hussain, who are not in Pakistan, were declared absconders by the court.

Sharif was arrested inside the court and taken to a jail in nearby Rawalpindi, Dawn newspaper reported. He is expected to be transferred to a prison in Lahore on Tuesday.