The justices went on to say, however, that a majority finds Northern Ireland's abortion prohibitions "disproportionate" and that they violate European human rights laws. That part of the ruling gave hope to abortion rights activists seeking to liberalize Northern Ireland's laws.
Strict Northern Ireland laws that prohibit abortions in cases of pregnancy as a result of incest or rape, and in cases when the fetus has a likely fatal abnormality, have drawn scrutiny since the Republic of Ireland voted overwhelmingly in May to repeal its own strict laws.
When Ireland replaces the constitutional ban with more liberal legislation after a debate in parliament, Northern Ireland will be the only remaining region in Britain and Ireland to outlaw the procedure.
Rosa Curling, from the law firm Leigh Day that helped bring the legal challenge, called the court's ruling "a momentous day for women in Northern Ireland" and said it is now up to British Prime Minister Theresa May to take action to ease the laws.
She said May has an obligation to make sure the U.K. government is "now longer acting unlawfully by breaching the human rights of women across Northern Ireland." However, the fact that the Supreme Court dismissed the case because of doubts about the Human Rights Commission's right to bring it means the judges' views on the anti-abortion laws do not have legal force, which is reassuring for abortion foes.
Laurence Wilkinson, legal counsel for ADF International, a group that advocates the right to live according to religious belief, said it welcomes the dismissal of the case, asserting that "at least 100,000 people in Northern Ireland are alive today" because of the decision not to liberalize laws in 1967, when Wales, England and Scotland eased restrictions.
He said the divisions among Supreme Court justices on the Northern Ireland laws revealed a "complete lack of consensus" on the matter. The issue is further clouded by the collapse of the Northern Ireland Assembly, a power-sharing regional government set up by the 1998 Good Friday accord.