Four ex-French peacekeepers have admitted their role in the killing of a suspected gang leader in Ivory Coast in 2005, but say they acted under orders. Prosecutors have asked a Paris court to jail Col Eric Burgaud and his three co-defendants for suffocating Firmin Mahe to death with a plastic bag.France sent a 4,000-strong force to its former colony after it descended into a now-ended civil war in 2002.Force commander Gen Henri Poncet was sacked following Mr Mahe’s death.He is not on trial, and denies ordering Col Burgaud to kill Mr Mahe. Mr Mahe, whom the French accused of being a murderer and a rapist, was arrested near the western town of Bangolo in May 2005.He was then suffocated with a plastic bag in the back of a military vehicle. His family has always insisted that he was innocent, and has been campaigning for the former peacekeepers to stand trial for his murder.‘Drive slowly’ On Thursday, prosecutors called for prison terms of between two and five years for the accused. Chief prosecutor Annie Grenier said the ex-soldiers had been involved in a "cold-blooded murder” in a country where they were supposed to help protect civilians. She said even if they acted on orders, it was their "duty to refuse to carry out an illegal order”.Col Burgaud said Gen Poncet ordering the killing with the phrase: "Drive slowly, you understand me?”He understood this to mean that it would be "best if Mahe arrived dead” and he relayed the instruction to his co-accused, Col Burgaud said.