The arrestee was identified as Md Ahad Mian alias Musa, 24, son of one Fazlul Haq of Bajitpur upazila in Kishorganj.

The railway police arrested Ahad at around 4:00am as he was moving around suspiciously. They challenged him and searched his body only to find that he was carrying the battery and electronic parts.

Officer in charge of the GRP Chittagong Station Nihar Ranjan Das told reporters that Ahad might be a member of any militant organisations and that he was making inconsistent statements.

Meanwhile, the police also arrested two persons with two knives from Chittagong Railway station at around 2:15pm on Thursday.

The arrestees were Nayan, 22, son of late Sirazul Islam of South Jiri in Patiya, and Jasim Uddin, 32, son of Ahammadur Rahman of East Madarbari.

"Nayan and Jasim might be involved with robbery and snatching in trains," said the OC.