Italian prosecutors have opened a murder investigation following the deaths of a mother and her teenage daughter after a pre-Christmas meal last year.
Sara Di Vita, 15, and her mother Antonella Di Ielsi, 50, fell ill after a lunch in their hometown of Pietracatella, a small municipality 260km (161 miles) south-east of Rome.
Sara's father Gianni - the former mayor of Pietracatella - was also taken to hospital, but he later recovered. The couple's eldest daughter was not there that day.
Doctors initially attributed the symptoms to food poisoning, but the new focus comes after laboratory tests revealed the presence of a deadly poison, ricin, Italian media say - even though police still do not have a suspect.
Doctors are said to have thought the infection originated from either fish or mushrooms and discharged the mother and daughter after they went to hospital.
