US to work with allies in Syria post-Assad: Biden

US President Joe Biden, in a statement on Sunday, said that the US will work with partners to deal with threats in Syria after Turkish-backed rebel group overthrew President Bashar-al-Assad's government.

The US President said that they will support Syria's neighbours during the transition period and will review the rebel group's commitment during the interim period.

Bashar al-Assad must be held accountable, says the US President.

He added that they will work with Syrian groups and regional leaders to ensure the transfer of power in Syria.

The Democrat expressed his worry over the dangerous and uncertain situation in Syria. "Don't know where Basha al-Assad is, heard he's in Moscow," said Biden when asked about Bashar fleeing to Moscow.

Syria rebel fighters raced into Damascus unopposed on Sunday, overthrowing President Assad and ending nearly six decades of his family's iron-fisted rule after a lightning advance that reversed the course of a 13-year civil war.

In one of the most consequential turning points in the Middle East for generations, the fall of Assad's government wiped out a bastion from which Iran and Russia exercised influence across the Arab world.

His sudden overthrow, at the hands of a Turkish-backed revolt, limits Iran's ability to spread weapons to its allies and could cost Russia its Mediterranean naval base. It also may pave the way for millions of refugees scattered for more than a decade in camps across Turkey, Lebanon and Jordan to finally return home.