U.N. chief asks Syria to allow speedy chemical attack investigation By Michelle Nichols and Louis Charbonneau UNITED NATIONS (Reuters) - U.N. Secretary-General Ban Ki-moon asked the Syrian government on Thursday to allow U.N. inspectors to investigate the latest alleged chemical attack in the country's civil war "without delay" and grant them access to the site near Damascus. Ban has asked the U.N. High Representative for Disarmament Affairs, Angela Kane, to travel to Damascus to push for access for the U.N. team, which arrived in Syria on Sunday to investigate several previous claims of chemical weapons use. Syrian President Bashar al-Assad's government is under increasing pressure from Western and Gulf Arab countries and Assad's ally Russia to allow access to the rebel-held site of Wednesday's pre-dawn attack. The opposition Syrian National Coalition has also urged U.N. access. "The Secretary-General believes that the incidents reported yesterday need to be investigated without delay," Ban's press office said in a statement. A formal request is being sent by the United Nations to the government of Syria in this regard. He expects to receive a positive response without delay. Syria's government offered no immediate public response to calls on Thursday for the U.N. team to inspect the site. Assad opponents gave death tolls from the attack ranging from 500 to well over 1,000 and said on Thursday that more bodies were still being found. The Syrian government has repeatedly denied using chemical weapons. The U.N. team, led by Swedish scientist Ake Sellstrom, is already looking into three claims of chemical use in Syria's conflict. The United Nations has received a total of 14 reports of possible chemical attacks - one from Syria's government and the rest from Britain, France and the United States. The Syrian government and the opposition have accused each other of using chemical weapons, and both have denied doing so. Ban said on Monday that if the experts found that chemical weapons had been used then it would be up to "the international community to determine what course of action should be taken to prove ... accountability and what needs to be done." "Use of chemical weapons is a violation of international law and international human rights law," Ban told a news conference. Sellstrom's team consists of experts from the Organization for the Prohibition of Chemical Weapons and the World Health Organization. Ban appointed Sellstrom to lead the inquiry in March, but diplomatic wrangling and concerns over safety prevented his team from entering Syria until this week. Reporting by Louis Charbonneau and Michelle Nichols; Editing by Sandra Maler and David Storey