Washington DC’s highest court has rejected a challenge against the district’s equal marriage law.

Same-sex marriage was legalised in the district in March but opponents wanted to put an initiative on the ballot asking voters to define marriage as between one man and one woman.

City officials refused it, saying it would break a district human rights law against discrimination.

Today, AP reports that the Court of Appeals ruled 5-4 that officials acted correctly in refusing to place the measure on the ballot.

When the law came into effect, opponents attempted a last-minute appeal to block the law but this was declined by the US Supreme Court.

Chief Justice John Roberts did not address the legal issues involved but instead said that such decisions should be taken by local courts.

He also declined a request for a referendum on gay marriage.