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Last year, the BBC reported on another decades-old case of babies swapped at birth, which again came to light after someone was given a DNA testing kit for Christmas.

"I know there will be families who have missing loved ones and worried about the remains and I want to reassure you that, if any relevant information comes to light, we will be in touch."

These departures may only come to light later, through checks against visa or flight records, for example.

The gang had initially come to light after an investigation was launched by Pfizer, the manufacturer of the genuine Xanax tablets, which are used to treat anxiety.

Police say they will consider "any relevant new information or evidence" should any come to light.