The main gas supply line to Narsingdi was damaged during construction work on a drain, according to Titas Gas authorities
The three were detained from Badda’s Aftabnagar area on Tuesday night, said RAB-3 Captain Col Tuhin Md Masud.
The three have been identified as BRAC University student Mushfiqul Huq, Mamunur Rashid and Kamal.
More information would be available at a press conference later on, he added.