A man and woman are being questioned by police after a home-made bomb was found in their West Yorkshire house.
The team was called back after a second suspect device was found
Bomb squad officers carried out a controlled explosion on the device after it was found at the house in Liversedge on Monday.
The team were called back to the house in Firthcliffe Road, Six Lane Ends on Tuesday morning after a second suspect device was found by officers.
The 30-year-old man and 34-year-old woman remained in custody on Tuesday.
A spokesman for West Yorkshire Police said: "We would like to reassure people that there was no threat to those living in the area and that at this time this is not being treated as a counter-terrorism incident.
"We would like to reiterate that this has nothing to do with recent events in London and Glasgow and we are not looking for anyone else in connection with this incident."
Officers remained at the scene on Tuesday as forensic tests were carried out at the house.