Iraqi officials said a suicide attacker has detonated an explosives-packed car at a funeral in a Shi'ite area of Baghdad, killing at least 20 people, the Associated Press reported.
Police said the attacker struck today in the Iraqi capital's Sadr City neighbourhood.
At least 40 people have been injured, police told the news agency.
The attack followed a suicide assault on a police headquarters and other insurgent attacks in northern Iraq earlier in the day that killed 11 members of the security forces.
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The letter was signed by the CBI, British Chambers of Commerce, the EEF, the Institute of Directors and the Federation of Small Businesses.
A spokesperson said Rory Stewart's remarks were in line with the British government’s stated position.