A federal appeals court panel in Boston declared the Defense of Marriage Act unconstitutional on Thursday, but said that only the Supreme Court will be able to settle the question of whether the federal government must recognize same-sex marriages from states where such unions are legal.

A unanimous panel of the U.S. Court of Appeals for the First Circuit said the act, which was signed by President Clinton and denies federal economic and other benefits for married people from same-sex couples married in states where it is legal, could not be justified under current precedents that protect minorities and other groups from discrimination.