(CNN) Dozens of people died last week in Nicaragua as a result of anti-government protests, human rights groups there told CNN Friday -- in contrast to the government's official death toll, which stands at 10.

The Nicaraguan Center for Human Rights, based in the capital city of Managua, reported 42 deaths on Sunday. On Saturday, the group had reported 43 people died but revised the death toll, saying they'd mistakenly included a person who was in critical condition.

The Permanent Commission on Human Rights said 58 people died. The government reported its latest death toll April 20.

The deaths came amid the largest street protests the country has seen since the civil war ended in 1990. Protesters clashed with security forces, and different groups among the demonstrators also clashed with each other.

Demonstrators in Managua threw rocks and set fires as police responded with tear gas and rubber bullets. Several television stations were taken off the air as the government tried to stem the unrest.

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