A 27-year-old man has been arrested in connection to an arson attack in Carmarthenshire.
Dyfed-Powys Police said a house in Erw Las, Llanelli, was deliberately set alight at about 01:20 BST on Monday while the occupants were asleep inside.
Nobody was hurt in the fire.
A force spokesman said: "The man has been arrested on suspicion of arson with intent to endanger life and remains in police custody while investigations continue."
Police would like to hear from anyone who saw someone carrying a fuel can in the area at the time of the fire.