Efforts are continuing to obtain the release of two British journalists who are being held by a group of former rebel fighters in Libya.
Reporter Nicholas Davies and cameraman Gareth Montgomery-Johnson were detained by members of the Misrata Brigade on Tuesday and are being held in Tripoli.
The HRW spokesman appealed to the militia, saying: "They must turn over their detainees to the government. They are undermining the future of Libya as a country ruled by law.
"This is not just about Nick and Gareth. This is about the thousands of Libyans and foreigners who have been picked up by militias who are freelancing with the law."