GENEVA (AFP) - The UN's refugee agency warned Friday that it would have to reduce or even suspend programmes to help hundreds of thousands of Iraqi refugees due to a funding shortfall. The Geneva-based United Nations High Commissioner for Refugees (UNHCR) said it needed another $127m to fund programmes for people uprooted in and around Iraq until the end of the year. "Without this support, the humanitarian crisis we have faced over the past two years may grow even larger," High Commissioner Antonio Guterres said. "We will not be able to help hundreds of thousands of the most vulnerable Iraqi refugees and internally displaced if we do not receive funding for the remainder of 2008," he added. Meanwhile, battles between Shia fighters and US forces in Baghdad's Sadr City killed 15 people and wounded dozens more overnight, US and Iraqi officials said on Friday. A mortar bomb hit the roof of the BBC office in central Baghdad on Friday, but there were no casualties, security officials and witnesses told AFP. A security official said the projectile struck the building in the Karrada district of Baghdad at around 2:45 pm (1145 GMT). Meanwhile, the US military denied on Friday that Al-Qaeda in Iraq chief Abu Hamza al-Muhajir had been captured by security forces. State television Al-Iraqiya reported Thursday that a man calling himself as Muhajir was captured by Iraqi forces in the northern province of Nineveh. US military spokeswoman Major Peggy Kageleiry said the detained individual was not Muhajir, whose real name according to the military is Abu Ayyub al-Masri. "They did not catch Abu Hamza al-Muhajir. Somebody with same name but not connected with him. It is not him," Kageleiry told AFP. When asked if the military confirmed Muhajir was not in the custody of security forces, she said: "I confirm that." Major General Abdul Karim Khalaf, spokesman for Iraq's interior ministry had told Al-Iraqiya on Thursday that the detained man claimed he was Muhajir and that investigations were under way to verify his identity. Khalaf said he was arrested in a raid on Wednesday in the Wad Al-Hajar region of Nineveh province. The region's capital Mosul is considered the last urban bastion of Al-Qaeda in Iraq, according to the US military.