A court in Cairo has resumed the trial of former Egyptian dictator, Hosni Mubarak, over his involvement in the violent crackdown during the North African country’s 2011 revolution.

Egyptian officials say the ousted dictator was taken to the Cairo court by a military helicopter from a military hospital on Saturday.

Mubark's sons, Gamal and Alaa, along with former interior minister and six security chiefs were also present.

Mubarak was convicted and sentenced to life in prison in June last year. But he appealed and the Supreme Court ordered a new trial.

After more than two years in detention, the court ordered Mubarak’s conditional release in August 2013 after being cleared in a corruption case.

Mubarak has been held at the military hospital since his release from Cairo's prison last month.

However, the 85-year-old dictator still faces charges of complicity in the killing of hundreds of protesters during the 2011 revolution that ended his decades-long grip on power.

Mubarak's case threatens to increase tensions across the North African country. The country plunged into turmoil after the army overthrew former president, Mohamed Morsi on July 3.

Some Egyptians are accusing the military-backed court of seeking to acquit the former dictator.