Mokhtar Lamani told the BBC that the humanitarian situation was almost a catastrophe. But he said it was the growing sectarianism that was now really frightening.
The Iraqi Prime Minister Nouri al-Maliki has reiterated his warning of what he called a plague of sectarianism after the worst week of violence since US troops withdrew in 2011.
He called his brother's execution unjust and an assassination of a man who refused violence, sectarianism and demanded legitimate rights peacefully in a country where Shias say they're treated as second-class citizens.