The European Union’s top diplomat suspects that damage to two underwater Nord Stream natural gas pipelines was sabotage and warned of retaliation for any attack on Europe’s energy networks.

In a statement on behalf of all 27 member states, EU foreign policy chief Josep Borrell said: “All available information indicates those leaks are the result of a deliberate act.

“Any deliberate disruption of European energy infrastructure is utterly unacceptable and will be met with a robust and united response.”

Seismologists reported on Tuesday that explosions rattled the Baltic Sea before unusual leaks were discovered on two underwater natural gas pipelines running from Russia to Germany.

The three leaks were reported on the Nord Stream 1 and 2 pipelines, which are filled with natural gas.

While they are not currently delivering the fuel to Europe, the damage means the pipelines are unlikely to be able to carry any gas to Europe this winter even if the political will to bring them online emerged, according to analysts.

Mr Borrell said the EU will support any investigation into the damage, and “will take further steps to increase our resilience in energy security”.

Mateusz Morawiecki, the Polish prime minister, has called the damage an “act of sabotage”, while his Danish counterpart Mette Frederiksen said she views the leaks as “deliberate actions”, and the Danish energy authority said any event like this was “extremely rare”.

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