The main gas supply line to Narsingdi was damaged during construction work on a drain, according to Titas Gas authorities
The house is owned by a Saudi expatriate. The raid unfolded around 10am on Saturday at the southwestern district's Gangni Upazila.
Superintendent of Police Anisur Rahman said, "The house at the Upazila's Bamandi is owned by one Mishkat Halim, who has been living in Saudi Arabia for 22 years."
"A tip-off led to the raid on the house beside the Meherpur-Kushtia Highway," said senior officer Rahman.
He said then they suspected militants with arms and explosives were inside the building.
"Police sealed-off the house and ended the raid," said the SP.
The detainees, who turned themselves to police, were being questioned at the Gangni Police Station, he added.