About the Chinese citizens held in Yemen, on the afternoon of May 16, local time, two Chinese citizens were held by local armed tribesmen in Shabwa province of Southeastern Yemen.

关于中国公民在也门被扣事件，当地时间5月16日下午，2名中国公民在也门东南部夏卜瓦省被当地武装部落扣留。

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All roads leading to the predominantly Sunni town of Qara Tappah, about 120km (75 miles) north-east of Baghdad, were blocked by armed tribesmen, AP news agency reported.

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Members of the Sudanese Armed Forces removed the "armed tribesmen" from Kutum town last Saturday, but the militiamen returned a day later to fight again, the OCHA said.

CNN: STORY HIGHLIGHTS

The challenge of "securing a cease-fire, removing armed tribesmen from urban centers, returning the military to the barracks and engaging in military-security reform will be serious stumbling blocks post-signing, " according to Longley Alley.

CNN: Yemen after Saleh: Still a treacherous road