The US Federal Maritime Commission (FMC) has thrown into question the containership merger between Japanese shipping giants NYK, MOL and K Line.

FMC said it rejected the deal on jurisdictional grounds because it does not have the authority to approve mergers.

"After careful consideration, the Commission determined that parties to the tripartite agreement were ultimately establishing a merged, new business entity and that action is among the type of agreements excluded from FMC review," it added.