COLOMBO - A Sri Lankan reporter has been sentenced to 20 years in jail for writing articles critical of the government's military operations.

JS Tissainayagam, an experienced columnist, was jailed after a court decided he had breached anti-terror laws.

He was found guilty of "causing communal disharmony," reports the BBC.

Tissainayagam, who wrote for several publications including the now defunct Northeastern Monthly magazine, wrote several articles in 2006 and 2007 accusing the government of withholding food and other essentials from Tamil-majority areas as a weapon of war.

The court decided that his articles broke the law because they were designed to create agitation between the Tamil minority and the Sinhala majority.

"The constitution guarantees media freedom, but no one has a right to deliberately publish false reports that would lead to communal violence," said the government prosecutor Sudarshana de Silva.

Tissainayagam's lawyer insisted that his client, who was also accused of having links to Tamil rebels, was innocent of the charges, and said he would appeal.

"He was never a racist and he at no time tried to arouse hatred," said his lawyer, Anil Silva, describing Tissainayagam as a champion for human rights.

"This is a good lesson for all journalists to be cautious when writing in future. He lost his job in the 1980s when talking about labour union rights. Now, he lost his freedom when talking about Tamil rights."

The journalist signed a confession but retracted it, saying it had been written under duress.

Campaigners say the case of Tissainayagam highlights the pressure that independent journalists in Sri Lanka have been under since the election of the country's current President, Mahinda Rajapaksa.

Rajapaksa was determined to end the country's long-running civil war and crush the rebel Liberation Tigers of Tamil Eelam, and campaigners say the government has been equally resolute about refusing to allow criticism.

Press campaigners say that at least 14 journalists and other media workers have been killed since the beginning of 2006, and scores have fled the country.

While officials claim the Sri Lankan media is independent, many reporters privately admit to a degree of self-censorship.

Tamil reporters are particularly fearful of angering the government.

A number of international journalists who have angered the government have been either expelled or threatened with expulsion.