Keith Noyahr, a senior journalist with Sunday Times was abducted in May, 2008 when he was returning from work. He was later released after being severely assaulted. He spent days in the hospital after the attack before he left the country.
An army major and two soldiers have been arrested for allegedly abducting Noyahr, police said.
The attack on him was one of the many high profile attacks against journalists during the regime of former President Mahinda Rajapaksa. Sri Lanka was ranked among one of the worst countries to work during Rajpaksa's regime.
The investigations include the assassination of Lasantha Wickrematunga, a high-profile Sri Lankan journalist who was critical of Rajpaksa's regime.