"Serious damage" caused by "substantial explosions – not done by an amateur". That's the assessment of the EU’s Economy Commissioner Paolo Gentiloni after gas leaks were discovered in the Nord Stream pipelines between Russia and Germany earlier this week. The former Italian prime minister tells FRANCE 24 that currently there is insufficient evidence regarding who may have been responsible, and that the priority is to strengthen the security of the Nord Stream, Baltic and other pipelines and energy infrastructure in Europe.