The trial into the deaths of five members of the same family in a fire has heard that no one would have been able to escape through the windows without breaking them.
Mr Stephen Andrews, a forensic fire investigation consultant, told the court that following extensive examination, he believed that the fire was started by a naked flame being held against a baby pushchair which was in the small communal hall on the ground floor.
Following extensive tests and the use of a specially trained dog used to detect flammable liquids he ruled out the possibility that the fire could have started by flammable material being poured through the letter box or by a carelessly discarded smouldering cigarette.
He said that in his opinion the "fire was started intentionally.”
Melanie Smith denies five charges or murder following the fatal fire at Maes y Groes in Prestatyn on October 19 of last year.
More top news
Finley Thomas was a "lovely, happy beautiful baby" and changed in the months leading up to his death, a court has heard.
There will be more Welsh athletes than ever before, at this year's World Powerlifting Championships in Texas in June.
Tree pollen levels are easing off now! But beware - grass pollen is just becoming airborne and levels will rise during settled spells.