by chance

"Then 15 years ago, in the mountains between Umbria and Marche, I found a tree almost in the middle of the woods," thanks to an elderly local woman who told her about it by chance.

The South American leader told CNN on Thursday that he believed it was "practically impossible" that the three chemicals would be found in high concentrations in the items by chance.

"It is absolutely not by chance that they went for these specific items," he told France 2 television last month.

Then, by chance, his wife wore a Victoria Beckham dress to date night; stunned by the quality of the garment, he changed his mind.

He said it would have been "the last approach any parent would have wanted in the circumstances", but by chance the couple were away.