TRIPOLI, July 10 (Reuters) - The United Nations has evacuated dozens of foreign staff from its mission in Libya due to a deteriorating security situation in the **rth African country, a U.N. spokesman said on Thursday. "They will return if the security situation improves," said Samir Ghattas, spokesman for the U.N. Support Mission in Libya (UNSMIL), without saying how many had left the country. Libya is in turmoil as the government and parliament are unable to curb militias that helped overthrow veteran ruler Muammar Gaddafi in 2011 but are **w defying state authority. ...

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