Used engine oil has been spilled on the fortifications along Marsamxett Road in Valletta, prompting the Malta Environment and Planning Authority to call on the Administrative Law Enforcement and the Resources and Infrastructure Ministry to investigate.

It will not be easy to remove the stain from the German Curtain of the fortifications, the MEPA said. The oil is thought to have been dumped in the water run-off gutter, then making its way through a spout or fissure in the parapet and cascading to the street below.