WATCH: UN chief Ban tries to quiet Syrian FM at peace talks

MONTREUX, Switzerland - United Nations Secretary-General Ban Ki-moon sparred with Syria's Foreign Minister on Wednesday when he tried to cut short the minister's speech to an international peace conference. Walid al-Moualem had already spoken for more than twice the 10-minute limit at the talks in Switzerland when Ban interrupted to urge him to bring his comments to a conclusion, but the intervention proved fruitless. 'You spoke for 25 minutes,' Moualem shot back. 'I came here 12 hours in the airplane. I need a few minutes to finish my speech.' 'Can you just wrap up in one or two minutes?' Ban persisted. 'No I can't promise you. I must finish my speech,' came the reply from Moualem, who used his address to accuse rebels of disemboweling pregnant women, raping them dead or alive and bombing mosques. He also told participants that it was up to Syrians to choose their leader, not foreign powers who are calling on President Bashar Assad to step down, and pointedly accused Turkey and Gulf Arab states of fueling the violence in Syria. Ban said he would have to give other speakers more time if Moualem did not stop, an appeal which also failed to impress the Syrian minister. 'You live in New York, I live in Syria. I have the right to give the Syrian version here in this hall. This is my right.' Ten minutes later, with no end in sight, Ban tried again. 'I will finish one sentence,' Moualem told him. 'One sentence or two. Just to keep your promise, one sentence,' the UN Secretary-General said. 'Syria always keeps its promise,' Moualem answered, before wrapping up his hard-hitting, 35-minute address about a minute later. At the start of the talks, aimed at ending Syria's near three-year conflict, Ban had urged all participants to 'refrain from language that could undermine chances of success at the conference', and to stick rigorously to their allocated time. 'I regret to tell you that from the beginning, this constructive mood and rules which I set and you agreed has been broken ... I hope that this will not be repeated. 'Please refrain from making any accusation from any specific countries and refrain from inflammatory remarks which must unnecessarily provoke the participating countries in good faith. I really appeal to all of you,' Ban told the participants. At the culmination of the day's talks, Ban called on both Syrian delegations to work sincerely for a solution to the nearly three-year-old conflict. Ban told participants to uphold the Geneva communique of June 2012 which would install a transitional government with full executive powers. 'I hope that the real negotiations will begin in all their sincerity and with the full speed to embrace these goals. May both Syrian delegations be guided by wisdom, a deep sense of urgency, a spirit of compromise and a determination to preserve their country and its unique social fabric and to end the suffering of its people.'

WATCH: UN chief Ban tries to quiet Syrian FM at peace talks

After speaking for more than double the allotted time limit, Ban Ki-moon tells Walid al-Moualem to conclude comments.

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