At least 36 people were killed during the weekend's clashes between Libyan Special Forces and Islamist militants in Benghazi, security officials said.
The government said more than 150 people have died, many of them civilian, in the capital Tripoli and Benghazi in two weeks of fighting as clashes forced UK and other foreign diplomats to pull out of the country.
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The Police Federation chairman said officers were often "letting someone off with a warning and hoping for the best".
A total of 21 are also injured by a blaze which ripped through the upmarket 22-storey hotel on the Black Sea coast.