Washington, Jan 19 (Agencies): The US Supreme Court on Tuesday let stand a law authorising homosexual marriage in the capital city of Washington, rejecting a challenge from activists opposed to same-sex marriage.

The top US court without comment turned down a petition from a group of Washington residents on their bid to put gay marriage to a city-wide referendum vote.

The high court decision, a blow to anti-gay marriage interests, came as another high profile case on the legal status of same-sex marriage in California, churned through the US legal system.