Police from three countries are continuing with their search for missing twins, Alessia and Livia, from Switzerland.
The 6 year old twins were taken from their mother by their father who killed himself after abducting them.
After taking his children he travelled to France and then Italy – where he threw himself under a train.
The twins parents had recently divorced and the father sent a letter to his ex-wife explaining how he could not live without her.
Investigators say they do not know whether the father took his children with him to France and Italy or not.
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