Greek authorities detained an American man Friday on the Greek island of Skiathos suspected of killing an infant found over the weekend in a Rome park and of having a role in the death of the infant’s mother, whose body was found nearby.

The American, who was not identified, was detained on a European arrest warrant issued in Italy, and he will be formally arrested when the warrant is forwarded, Greek police told The Associated Press. The suspect will appear before a judge in an extradition hearing next week and has the right to challenge his transfer.

The bodies of the baby girl and mother, also identified as Americans, were found in Rome’s Villa Pamphili park on Saturday, the Italian daily Corriere della Sera reported. The mother’s body was under a black bag, having been killed several days before the infant, who was found several hundred meters (yards) away in undergrowth.