At least 29 civilians, including women and children, have lost their lives in fresh air raids conducted by the US-led coalition in Syria’s northern city of Raqqah over the past 24 hours, a monitoring group says.

The so-called Syrian Observatory for Human Rights (SOHR) said on Tuesday that the victims included a family of 14 who had been displaced from the central city of Palmyra.

There were 14 children and nine women among the victims, said the report.

The SOHR further warned that the death toll could rise as a number of people had been critically wounded in the aerial assaults.

The US and its allies launched a campaign of airstrikes against what are said to be Daesh positions inside Iraq in August 2014 after the Takfiri terrorist group overran parts of the Arab country.

The coalition expanded its campaign to Syria in September 2014 without any authorization from the Damascus government or a UN mandate.

The strikes, however, have on many occasions resulted in civilian casualties and failed to fulfill their declared aim of countering terrorism.

The coalition admitted in July that its air raids had killed at least 600 civilians in both Iraq and Syria over the past three years, but monitoring group Airwars said the actual number is at least 4,354.

The file photo taken by the US Air Forces Central Command shows a pair of US Air Force F-15E Strike Eagles flying over northern Iraq after conducting airstrikes in Syria. (Via AFP)

Last week, Damascus wrote to the UN, calling for the dissolution of the “illegitimate” US-led coalition over its “continued and systematic massacre” of civilians.

In two letters addressed to UN Secretary General Antonio Guterres and the world body’s Security Council, the Syrian Foreign Ministry complained that the coalition was flagrantly violating the international humanitarian law by targeting residential neighborhoods and using internationally banned white phosphorus munitions in its strikes.

Back in June, UN war crimes investigators denounced a “staggering loss of civilian life” caused by the US-led attacks on Raqqah, Daesh’s de facto capital in Syria.