Washington alleged that the bombings were the work of Moscow. Moscow pointed its finger at Britain and the United States. Germany, Denmark and Sweden set up a joint investigation, but refused to allow Russia to participate. Some sections say pro-Ukranian groups did it.
Investigative journalist Seymour Hersh, who won a Pulitzer Prize in 1970, said in a blog post on Wednesday, citing an unidentified source, that U.S. navy divers had destroyed the pipelines, with explosives on the orders of President Joe Biden.
A sharp drop in pressure on both pipelines was registered on Sept. 26 and seismologists detected explosions, triggering a wave of speculation about sabotage to one of Russia's most important energy corridors.