CHICAGO (Reuters) - A prominent U.S. Catholic nuns' group said on Thursday it was "stunned" that the Vatican reprimanded it for spending too much time on poverty and social justice concerns and not enough on abortion and gay marriage.

In a stinging report on Wednesday, the Vatican said the Leadership Conference of Women Religious had been "silent on the right to life" and had failed to make the "Biblical view of family life and human sexuality" a central plank in its agenda.

It also reprimanded American nuns for expressing positions on political issues that differed, at times, from views held by American bishops. Public disagreement with the bishops - "who are the church's authentic teachers of faith and morals" - is unacceptable, the report said.

The Vatican's Congregation for the Doctrine of the Faith issued a "doctrinal assessment" saying the Holy See was compelled to intervene with the Leadership Conference of Women Religious to correct "serious doctrinal problems."

The nuns' group said in a statement on its website, "The presidency of the Leadership Conference of Women Religious was stunned by the conclusions of the doctrinal assessment."

It added the group may give a lengthier response at a later date.

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