Source:
BBCUS Vice-President Joe Biden has urged Iraqi leaders to work together to avert renewed sectarian strife.
The White House said Mr Biden had expressed his concerns in a phone call to Shia Prime Minister Nouri Maliki.
It comes after an arrest warrant was issued for Iraq's Sunni Vice-President, Tariq al-Hashemi, on terror charges. <snip>
The entire al-Iraqiyya Sunni political bloc is boycotting parliament and the cabinet in protest at the warrant, while the Sunni Deputy Prime Minister Saleh al-Mutlak has said Iraq is facing "chaos and disaster".
Read more:
http://www.bbc.co.uk/news/world-middle-east-16279889
Again, much more at the link, including "fears that the fragile government may crumble," etc., and an excellent analysis by the BBC's Jim Muir.