Prosecutors said a 16-year-old boy was detained at his home while a 15-year-old girl was detained after presenting herself to police.

The child's lifeless body was found on the banks of the Vilaine river in the northwestern city of Rennes after a fisherman heard the cries of a child near the river

French police launched a murder investigation Sunday after after a 12-year-old boy was found dead near a city centre with a towel tied around his neck, prosecutors said.