Iraq and Syria are using barrel bombs in populated areas in direct contravention of a United Nations resolution, and causing a 'devastating loss of innocent lives', a human rights expert has revealed.
The bombs have cost the lives of up to 20,000 civilians in Syria alone since the conflict began there in 2011, UN public health consultant Cesar Chelala said.
He wrote in the Japan Times: "UN Security Council Resolution 2139 of February 22, 2014, ordered all parties to the conflict in Syria to end the use of barrel bombs and other weapons in populated areas. In spite of that, both the Syrian and the Iraqi governments continue using them against civilians.
"Human rights groups have characterized them as weapons of terror and illegal under international conventions."
Barrel bombs are an improvised explosive device (IED), sometimes described as a 'flying IED' and can be made from a barrel that has been filled with high explosives, shrapnel, oil and chemicals and then dropped from a plane or a helicopter, Mr Chelala said.
He added: "Because different explosives can fit into them, and due to their poor accuracy and indiscriminate effect in civilian areas, they provoke devastating effects and loss of lives. These bombs were used earlier in South Sudan in the 1990s, expelled from transport planes.
"Since then, they are now being extensively used by the Syrian Air Force and by Iraqi government forces, as during the Anbar clashes."
Erin Evers of Human Rights Watch told the paper: "What is happening now in Iraq started in Syria. If I were Iraq's prime minister seeing Assad next door using the same tactics without even a slap on the wrist and gaining ground as a result, it stands to reason he would say, 'Why the hell not?’”
Mr Chelala added: "Residents of Tikrit, Baiji and Mosul also report that government forces dropped barrel bombs on their cities during the 2014 northern Iraq offensive, as they did later in July in Fallujah and the nearby town of Al-Karmath.
"Use of barrel bombs in Syria was first identified in August 2012. Although a Russian military expert initially denied its existence, an October 2012 video showed a barrel bomb being lit and dropped by Syrian Air Force personnel.
"It is estimated that between 5,000 and 6,000 barrel bombs have been used and that more than 20,000 people have been killed by them since the conflict in Syria began in March 2011."
Aleppo has been the focal point for the use of barrel bombs by the Syrian government, Mr Chelala said, adding that according to evidence gathered by Human Rights Watch, Syrian government forces had increased the use of barrel bombs since the UN Security Council passed the resolution banning their use last February.
He wrote: "From the time the resolution was passed until July 14, Human Rights Watch identified more than 650 major strikes in Aleppo neighborhoods held by groups opposed to the government.
"According to statistics from the Violations Documentation Center, aerial bomb attacks killed 1,655 civilians in the Aleppo governorate between February 22 and July 22.
"Area bombing or carpet bombing — where conventional shells are used to bombard a large area from the air — a practice widely used during World War II — was banned by the 1977 Additional Protocol I to the Geneva Convention, still considered the cornerstone of contemporary humanitarian law.
"U.N. Secretary General Ban Ki-moon has severely criticized using weapons that increasingly kill innocent civilians and continue to fuel the conflict.
"Further escalation of violence will only serve the agenda of those who see military means as the only way forward, at the expense of the Syrian people, who have suffered enough already."