The US has reportedly decided to halt its airstrikes against the Islamic State (Isil) in Syria after it withdraws its troops, a move that would effectively bring an end to the entire Western air campaign against the jihadists.

US officials said that Donald Trump’s decision to pull US forces out of Syria would also mean an end to American airstrikes against Isil fighters in the country, according to Reuters.

The Pentagon did not deny the report and refused to say if US airstrikes would continue after American forces withdraw in March next year.

“As long as there are US troops on the ground we will conduct air and artillery strikes in support of our forces. We will not speculate on future operations,” a Pentagon spokeswoman told The Telegraph.

The US provides the overwhelming majority of the firepower for the Western air campaign against Isil and is responsible for around 95 per cent of the air strikes in Syria, according to Airwars, a monitoring group.

Britain and France have both signalled that they intend to continue striking Isil even after the US withdraws its ground troops but Airwars said that might not be possible if America withdraws from the air campaign.