Syria`s de facto leader Ahmed al-Sharaa has been named president for the "transitional period", state media report, 7 weeks after he led the rebel offensive that overthrew Bashar al-Assad, writes BBC.

Rebel military commander Hassan Abdul Ghani also announced the cancellation of Syria`s 2012 constitution and the dissolution of the former regime`s parliament, army and security agencies, according to the Sana news agency.

As president, Sharaa would form an interim legislative council to help govern until a new constitution was approved, he said. All rebel groups which opposed Assad in the 13-year civil war would be dissolved and integrated into state institutions, he added.

The announcements came during a event in Damascus attended by the commanders of factions who fought alongside the rebel alliance led by Sharaa’s Islamist group, Hayat Tahrir al-Sham (HTS). It was entitled the “Conference for Announcing the Victory of the Syrian Revolution".

Addressing the commanders wearing military uniform, Sharaa stressed that Syria`s new leadership faced a “heavy task and a great responsibility". He said the first priority was to "fill the power vacuum in a legitimate and legal way". Secondly, he added, civil peace should be maintained by "seeking transitional justice and preventing revenge attacks". He also called for state institutions, particularly the military, security agencies and police, and economic infrastructure to be rebuilt.