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Ban called for "utmost restraint" after a violent crackdown on protesters by Yemeni authorities claimed five lives.
"He urges the government and opposition groups to reach an understanding on entering into a genuine and broad based dialogue leading to concrete results as to avert a further deterioration of the situation," Ban spokesman Martin Nesirky said.
A 12 year old boy was among those killed Saturday across the country, which has been gripped by deadly protests demanding the ouster of President Ali Abdallah Saleh.