Outbreaks of disease are increasing as public health services, including vaccinations, are disrupted
Security forces protecting the parliament withdrew from the site, the witnesses added.
Demonstrations took place on Friday in Tobruk, Benghazi and some smaller towns over a failure of government.
Libya has been in chaos since the 2011 NATO-backed uprising that ousted Muammar Gaddafi. In 2014, it split between warring eastern and western factions before a peace process beginning in 2020 tried to knit the country back together.
However, after a scheduled election was halted in December, the eastern-based parliament said the interim unity government of Abdulhamid al-Dbeibah had expired and it appointed Fathi Bashagha to replace him.