An alleged jewellery store robber who says he kissed a hostage out of compassion was tracked down through his DNA, a Paris newspaper reports.
He and another man were said to have seized an employee of the store in the French capital last April, holding her in her home, says Le Parisien.
Tying her up, they poured water on her, saying it was petrol, and threatened to burn her if she did not co-operate.
Detectives later traced the DNA from the woman's cheek to the suspect.
Now in prison in the south of France for separate offences, the suspect, 22, said he had kissed her to "relieve her trauma", an unnamed police source told Le Parisien.
Two masked men seized the woman outside her home before forcing her inside.
They frightened her into divulging the codes of the alarm system and the safes in the unnamed jewellery store, in Paris's eastern 20th arrondissement.
One of the gang then went to the store and robbed it while the other man stayed with the woman, who was held for four hours.
Once freed, the store employee alerted police and a DNA sample was taken, which finally led to the suspect in his prison cell in the Nimes area on 22 January.
France saw a spate of jewellery store robberies last year,