At least 50 metres of pipeline is missing after explosions in September - and the EU suspects sabotage. Traces of explosives have been found at the site of the damaged Nord Stream pipelines, say Swedish investigators. The finding suggests the pipelines were damaged by "gross sabotage", a Swedish prosecutor says. Swedish and Danish authorities are investigating four holes in the Nord Stream 1 and 2 pipelines which link Russia and Germany via the Baltic Sea and have become a flashpoint in the Ukraine crisis. The findings come after a preliminary investigation last month showed that the leaks on the key gas route were caused by powerful explosions. Russian forces 'preparing for further breakthroughs' - Ukraine war latest updates At least 50 metres worth of pipeline is believed to be missing from Nord Stream 1 following the damage on 26 September. Russia has repeatedly denied being involved in the attack on the pipeline and made a series of wild claims that the UK's Royal Navy was responsi