The Arabic Network for Human Rights Information (ANHRI) called for an end to massacres in Libya that have left over 80 people dead during three days of peaceful protests.
Anti-regime protesters across the country are demanding political freedoms, human rights and the eradication of corruption.
In a statement, ANHRI called on the Libyan authorities to stop killing and intimidation, to release detainees and to punish the perpetrators of the 1996 Abu Salim prison massacre.
Rights groups accuse the Tripoli prison's administration of massacring over 1200 inmates that year. Libyan authorities say the number has been exaggerated for political reasons, and is in fact much smaller.
Libyan President Muammar Qaddafi has held power since 1969.