A leading international rights group says all sides fighting in Yemen have left a "trail of civilian death and destruction" in the conflict, killing scores of innocent people in what could amount to war crimes.

Amnesty International accused both the Saudi-led coalition carrying out airstrikes in Yemen and attacks by forces supporting and opposing the rebels, known as Houthis, in a report on the fighting released Tuesday.

The London-based rights group says that in the southern cites of Taiz and Aden, dozens of children are among the dead.

The fighting in Yemen pits the Shiite Houthis and troops loyal to former President Ali Abdullah Saleh against southern separatists, local and tribal militias, Sunni Islamic militants and troops loyal to President Abed Rabbo Mansour Hadi, who is exiled in Saudi Arabia.