A 'British' ISIS fighter has proclaimed that the terrorist organisation are planning new attacks on the West in a chilling new video which has appeared online.

The short clip shows a young black man speaking directly to the camera, with what sounds like a British accent, warning of terrorist attacks in Italy and Turkey, threatening to 'slaughter' civilians in their own homes.

The video is believed to have been filmed in the Syrian city of Raqqa, Islamic State's self-declared 'capital', during the recent battles between ISIS jihadists and Syrian Democratic Forces (SDF).

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Threats: An ISIS fighter is seen speaking with what could be a British accent, as he warns of future terrorist attacks in Europe, saying the jihadists have their 'eyes' on Rome and Istanbul

The SDF, backed by a U.S.-led coalition are making headway in their campaign to re-take Raqqa from ISIS.

It shows the 'British' man walking up to the camera from his position next to a machine gun.

The man, speaking with a British twang, addresses the U.S. President directly, calling him 'the new pharaoh'.

'This is a message to the new pharaoh of today, Donald Trump!

'You may have your eyes on Raqqa and Mosul but we have our eyes on Constantinople and Rome,' he adds, using the pre-20th Century name for the Turkish capital of Istanbul.

Warnings: The man adds that 'with Allah's permission' ISIS will slaughter Europeans in their own homes in future attacks

Hate: In the video, the unidentified ISIS fighter speaks directly to U.S. President Donald Trump, calling him 'the new pharaoh'

'Bi Idhn Allah, Bi Idhn Allah [with Allah's permission]. We will slaughter you in your own houses.'

The man is seen jabbing at the camera with his finger before the video cuts out.

A Kurdish spokesman for the U.S.-led coalition said today that SDF fighters are on the verge of seizing full control of the southern neighborhoods of Raqqa, making 'consistent gains' every day.

The SDF launched the U.S.-backed campaign to seize Raqqa in early June, with SDF fighter advancing from the east and the west now only separated by a few streets as fighting continued.

Full control of the southern districts would sever Islamic State's last remaining path to the Euphrates River which is to the south of the city.

'There is a fierce resistance from Daesh [ISIS], so we can't determine when exactly we'll take (full control). Around 90 percent of the southern neighborhoods are liberated,' the official added.

War: The video is believed to have been filmed in Raqqa, Syria, during recent battles between ISIS and the U.S.-backed Syrian Democratic Forces, who are closing in on the terrorists

However, the civilians who remain in Raqqa - some 50,000 - are at great risk, The World Health Organisation has warned.

The UN agency said there are critical shortages of medical supplies in Raqqa, described the situation as 'particularly worrying' In an appeal for $20 million to respond to the crisis.

'Raqqa's main hospital and many other health care facilities have closed due to airstrikes,' it said. 'The facilities that are still functioning face critical shortages of medicines, supplies and equipment.'

'Water and electricity are available only intermittently,' it said, adding that civilians were unable to move freely due to travel and security restrictions imposed by IS.

Islamic State has lost large expanses of territory in Syria over the last year to separate campaigns waged by the SDF, the Russian-backed Syrian military, and Turkey-backed Syrian rebels.