Explosions rocked two homes in the same town within the space of 24 hours.
The first blast took place in Bradford Road, Huddersfield, at around 1am on Wednesday, followed by another one in Dearne Fold at around 11.34pm.
Police suspect the second incident is a case of arson, although the cause of the first blast is not yet clear.
One resident said they thought a 'bomb' had gone off when they heard an explosion in Bradford Road.
Daniel Akers, who lives near the scene, told YorkshireLive: "I was just dropping off and it woke me up as it was a huge bang. I checked the clock at the time and was surprised as it was exactly 1am.
"The clock saying exactly 1:00 added to the weirdness of it all, I assumed it was the chemical factory!"
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Emma Stead added: "I thought it sounded like a lorry crashing into a brick wall."
Another local said 'I thought it was a bomb', while resident Michelle Wilson compared it to the sound of a car tank exploding.
A resident who lives near the Dearne Fold home described how he saw a '20ft plume of smoke' above the house after hearing an explosion, YorkshireLive reports.
He said: "I heard it, after the explosion I stuck my head out the window and I saw the smoke above the house which blew away in about one minute.
"I heard this woman running out and I heard a local male man."
He added that he heard a loud interaction between people.
No-one was injured in Dearne Fold or Bradford Road, police said.
Addressing the Dearne Fold incident, West Yorkshire Police said: "At 11.34pm yesterday (Wednesday), police received a concern for safety call following what was reported to be an explosion at a house in Dearne Fold, Huddersfield.
"Emergency services attended the scene and found damage has been caused to the property and to cars outside.
"No one was injured in the incident, which is currently being treated as arson, and enquiries are continuing."
A spokesman for the force also said officers were called to reports of a 'small explosion' at a house in Bradford Road at around 2am on Wednesday.
They added: "A police scene was put in place and a small number of neighbouring properties were evacuated with residents temporarily rehoused
"No-one was injured in the incident and enquiries into the cause of the explosion remain ongoing with West Yorkshire Fire and Rescue Service."
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A spokesperson for West Yorkshire Fire & Rescue Service added: "We were called to reports of a domestic property fire at 11.40pm on December 8 at Dearne Fold in the Lindley area of Huddersfield.
"Three crews attended (1 Rastrick, 2 Huddersfield) and extinguished the blaze.
"There are no reports of any injuries.
"This has been marked as a police incident."
