THIRUVANANTHAPURAM: A Sri Lankan youth was taken into police custody for under suspicious circumstances from Thampanur bus stand here on Saturday, sources said.According to the preliminary investigation, the youth was not holding valuable travel documents. The arrested was identified as Maluk Juth Milkon Dwias. He looks about 35 years old. Taken to the Fort Assistant Commissioner’s office, Malik is being quizzed by IB officers. The police informed that the arrest will be registered only after detailed questioning. A train from Nagercoil to Varkala has been found in his possession. NIA has been informed by the police.