A town councillor has been charged with causing an explosion, after people were evacuated from their homes in Denbigh.
John Larsen, 46 and from Lenten Pool, is due to appear before magistrates in Prestatyn later today.
He is a Liberal Democrat on Denbigh Town Council.
A 40-year-old woman also arrested has been released on bail pending further inquiries, North Wales Police said.
Residents were evacuated from their homes on Friday night and again on Saturday, as an army explosives unit searched a house, after what police described as a series of incidents whereby objects were ignited in the town.
For years Mostyn House in Denbigh was a landmark for the wrong reasons. It was a building almost three hundred years old that had more than reached its sell by date - and was close to crumbling into a pile of rubble.
But thanks to one man's determination, a lot of funding and a thousand days of hard work - what was a building site has been transformed back into one of Wales' most remarkable houses.