Six pirates in a skiff approached a bulk carrier underway. The Master contacted a warship in the vicinity when the skiff came to a distance of 2.5nm. The naval warship responded, and a helicopter was launched. The alarm was raised, non-essential crew mustered in the citadel and the Master took anti-piracy measures. Machine guns and an RPG were sighted on the skiff when it closed to a distance of five cables from the ship. The helicopter arrived on the scene, resulting in the pirates aborting the attempted attack.