CAIRO (Reuters) -The Saudi-led coalition fighting in Yemen said on Tuesday it launched air raids on "legitimate" Houthi military targets in the capital Sanaa including a "secret" site belonging to the Iranian Revolutionary Guards, state TV reported.

       The coalition asked civilians not to gather around or approach potential targets.

       The Iran-aligned Houthis' main broadcaster, Al Masirah TV, said three air strikes by the Saudi-led coalition had hit Sanaa airport, while a fourth raid targeted a park.

       The raid is one of several the coalition has carried out this month over the densely populated capital city of Sanaa.

       Houthis have repeatedly launched cross-border attacks on the kingdom using drones and missiles since the coalition intervened in Yemen in March 2015 after the movement ousted the Saudi-backed government from the capital.

       The conflict is widely seen as a proxy war between Saudi Arabia and Iran. The Houthis are pressing an offensive in Marib, the internationally recognised government's last northern stronghold, as well as in other areas in Yemen.

       (Reporting by Alaa Swilam; Editing by Stephen Coates)