The surroundings of the Ratmalana airport were searched in a joint operation conducted by the Air Force and the Police, following reports that the airport could come under LTTE attack, Police said.
The operation carried out on Thursday night lasted till Friday morning and 46 Tamil youths were taken in for questioning.
Fifteen youths were released immediately while the others were detained for further questioning but they were also released after a security screening.
Mt. Lavinia police Superintendent T. Arasarathnam said the operations would continue in the area with house-to-house searches being conducted at random.