Updated

An 80-year-old Spanish nun has refused to testify at a court hearing about her alleged involvement in the stealing of newborn babies from their parents and selling them to other families.

Spanish police have investigated hundreds of cases amid allegations of baby trafficking dating from the years after Spain's 1936-39 civil war and supposedly a few even in the mid-1990s.

Authorities were alerted by an association of people searching for lost relatives. The group alleges the scheme involved a nationwide network, including doctors, nurses, midwives, nuns and intermediaries. Mothers were told their babies had been stillborn.

Sister Maria Gomez is the only person subpoenaed so far. She appeared in court Thursday and told the judge she would exercise her right to remain silent.

(This version corrects headlines to say hearing instead of trial.)