evidence: Two undersea leaks that began in the Russian-owned Nord Stream gas pipelines on Monday were likely caused by powerful underwater explosions, according to Swedish and Danish seismographic data. [...] German and Danish officials said both the Nord Stream 1 and Nord Stream 2 pipelines showed sudden losses of pressure late Monday, which they said could only be caused by a leak from large holes in the pipelines. [...] Danish authorities reported the location of the Nord Stream 1 leak as northeast of the Baltic Sea island of Bornholm, and the Nord Stream 2 leak as southeast of the island. German media, quoting unnamed security officials, say it's possible the leaks are a result of an act of sabotage, as it's extremely rare for undersea, concrete-coated steel pipes to break on their own. Authorities have halted all shipping in the area around the leaks.