The ancient city of Palmyra is "like a city of ghosts" after Syrian government forces drove Isis militants from the strategic stronghold.

Residential neighbourhoods in the adjacent modern towns were found deserted. Residents told The Associated Press Isis had evacuated all of Palmyra's civilians to other territories under its control.

"It was like a city of ghosts, we did not see a single family in the town," one of the first journalists to see the liberated city told BBC Radio 4.

"It's not completely clear, but it's understood Isis forced the residents out of the town and forced them to flee with them."

Syrian government forces retook "complete control" of the city by Sunday, marking the biggest military defeat Isis has suffered so far.

Their forces were driven out by Syrian troops and Lebanese Hezbollah militiamen, backed by Russian air strikes.

Troops loyal to Bashar al-Assad celebrate on the edge of Palmyra (Reuters)

Syrian pro-government forces drive a tank on the outskirts of Palmyra during a military operation to retake the ancient city from Isis (Getty)

Over 400 Isis fighters were killed in the battle for the city, according to Rami Abdulrahman, the director of the UK-based Syrian Observatory for Human Rights.

Russian jets carried out 40 combat sorties around Palmyra on Sunday, striking 117 "terrorist targets" and killing 80 Isis fighters, according to Moscow's defence ministry.

Palmyra recaptured by Syrian government forces Show all 10 1 /10 Palmyra recaptured by Syrian government forces Palmyra recaptured by Syrian government forces Palmyra recaptured by Syrian pro-government forces Graffiti on the ancient stones reads in Arabic ‘Shooting without the permission of the chief is prohibited’ Getty Palmyra recaptured by Syrian government forces Palmyra recaptured by Syrian pro-government forces Damaged artefacts lay inside the museum of the historic city of Palmyra Reuters Palmyra recaptured by Syrian government forces Palmyra recaptured by Syrian pro-government forces Syrian pro-government forces rest by Palmyra Citadel as they take control of the city from the hands of Isis Getty Palmyra recaptured by Syrian government forces Palmyra recaptured by Syrian pro-government forces The UNESCO world heritage site appears surprisingly intact after its recapture from the militant group Getty Palmyra recaptured by Syrian government forces Palmyra recaptured by Syrian pro-government forces Many had feared the ancient city would be destroyed following its capture by Isis in May Getty Palmyra recaptured by Syrian government forces Palmyra recaptured by Syrian pro-government forces Smoke billows from the Palmyra Citadel as Assad’s forces drive the Jihadist group from the city Getty Palmyra recaptured by Syrian government forces Palmyra recaptured by Syrian pro-government forces Palmyra is one of the ‘most important cultural centers of the world’ Unesco says Getty Palmyra recaptured by Syrian government forces Palmyra recaptured by Syrian pro-government forces Pro-government forces play football in the streets following the recapture of the city Getty Palmyra recaptured by Syrian government forces Palmyra recaptured by Syrian pro-government forces The extent of the destruction caused by Isis’ 10 month occupation of the city has yet to be fully realised Getty Palmyra recaptured by Syrian government forces Palmyra recaptured by Syrian pro-government forces The City Council of Palmyra building in ruins Reuters

The extent of the destruction remains unclear however, with initial footage on Syrian TV showing widespread rubble and shattered statues.

A sculpture of the Greek goddess Athena was shown decapitated, and the museum's basement appeared to have been dynamited, with broken statues littering the floor.

But Maamoun Abdulkarim, director of the museums and antiquities department in Damascus, said Palmyra's Great Colonnade had suffered only minor damage.

"We will rebuild what you have destroyed," he said, addressing Isis.

Syrian forces say they will use Palmyra as a base to "broaden operations" against Isis, particularly towards the extremist group's de facto capital, Raqqa, and the eastern city of Deir Ezzor.