"Mines and improvised explosive devices (planted) in or near homes have caused more than 100 victims," the UN mission in Libya has said in a statement.
Libya's UN-backed government launched Operation Peace Storm in March to counter attacks on the capital and recently regained strategic locations in a major blow to warlord Haftar's militia.
"There are violations by land, sea, and air," UN representative Stephanie Williams says, warning a fragile truce was hanging "by a thread" as daily life in the country worsens.
The UN is working with the Libyan authorities to transfer control of prisons from armed groups to trained professionals.
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