A Tamil journalist has been reported missing in northern Jaffna peninsula and an international rights group on Saturday asked the Sri Lankan government to help trace him.
When S Ramachandran (37), who works as a stringer for two Tamil-language newspapers, did not return home on Thursday, his father lodged a complaint with the local police.
"We are concerned about the disappearance of ... Ramachandran and call on authorities to do everything in their power to locate him and bring him home safely," said Executive Director Joel Simon of the Committee to Protect Journalists in a statement.
Police could not be reached in Jaffna for comment.
Abductions and political killings are common in Jaffna, and Tamil journalists have been a particular target of physical attack in recent years.
"The threat of violence has severely chilled coverage of human rights abuses in the area," the CPJ statement quoted the Colombo-based Free Media Movement, a rights group of Sri Lankan journalists, as saying.
Sri Lanka's north and east have witnessed increasing violence and abductions since last year when a Norwegian-brokered 2002 ceasefire nearly collapsed.
The Tamil Tigers have been fighting to create a separate homeland for Sri Lanka's 3.1 million minority ethnic Tamils since 1983.
The government says it is willing to give autonomy to areas where Tamils are in the majority, but the rebels insist on sweeping changes that the government say would infringe on the country's sovereignty.