Fourteen people were injured in clashes between security forces and demonstrators in the eastern city of Benghazi overnight, a Libyan newspaper reported.
The paper, Quryna, said the unrest late on Tuesday was the work of "saboteurs" among a group of protesters.
Three demonstrators and 10 members of the security forces were injured, a hospital director said, quoted in the newspaper, without identifying the other casualty. None of the injuries was serious.
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Security forces had intervened to halt a confrontation between supporters of Libyan leader Moamer Kadhafi, who has been in power for more than 40 years, and the demonstrators, it said.
The protest was started by families of prisoners killed in a 1996 shooting in Tripoli's Abu Salim prison demanding the release of their lawyer, it said.
