Article 6 1.

If irregularities or information give rise to a suspicion that a ship which is voluntarily within a port or at an off-shore terminal of a Member State has been engaged in or is engaging in a discharge of polluting substances into any of the areas referred to in Article 3(1), that Member State shall ensure that an appropriate inspection or other appropriate action, taking into account the relevant guidelines adopted by the IMO, is undertaken in accordance with its national law.