UN chief accuses Assad regime of killing most civilians in war

United Nations Secretary-General Ban Ki-moon accused the Syria's Bashar al-Assad regime on Tuesday of killing the most civilians during the country's five year conflict and said "powerful patrons that keep feeding the war machine also have blood on their hands."

In his final address to the annual gathering of world leaders at the United Nations, Ban said the Syrian regime "continues to barrel bomb neighborhoods and systematically torture thousands of detainees.

In his speech Ban also expressed regret for sexual abuse by U.N. peacekeepers and an outbreak of cholera in Haiti during his final address to the annual gathering of world leaders in New York.

He said these two matters had "tarnished the reputation of the United Nations and, far worse, traumatized many people we serve."

Ban will step down at the end of 2016 after serving two five-year terms.