The US military is denying an Iraqi government claim to have arrested the leader of al-Qaeda in Iraq. On Thursday, Iraqi officials said Abu Ayyub al-Masri had been captured in the northern city of Mosul. But the Pentagon now says the apprehended suspect only had a similar name. Meanwhile, the US-led assault on the Shia stronghold of Sadr City in Baghdad continues. At least four people were killed and more than fifty wounded in overnight clashes.