Danish ships monitor the gas leak in the Baltic Sea off the coast of Denmark September 30, 2022. (Danish Defense Command/Handout via REUTERS)

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 Danish findings appeared to be similar to those of Swedish prosecutors, who said two other holes in the pipelines also seemed to have been caused by explosions. A section measuring at least 50m is missing from the ruptured Nord Stream 1 gas pipeline, Swedish daily Expressen reported on Tuesday.

World leaders have called the damages an act of sabotage but it still remains unclear who might be behind the detonations.