While the pipelines, which are operated by a consortium majority-owned by Russian gas giant Gazprom, are not currently in operation, they both still contain gas but the environmental impact appeared limited so far.
One of the leaks on Nord Stream 1 occurred in the Danish economic zone and the other in the Swedish economic zone, while the Nord Stream 2 leak was in the Danish economic zone.
A leak was first reported on Nord Stream 2 on Monday.
"Authorities have now been informed that there have been another two leaks on Nord Stream 1, which likewise is not in operation but contains gas," Danish climate and energy minister Dan Jorgensen told AFP in a statement on Tuesday.
"It is too early to say anything about the causes of the incidents," the Danish Ministry of Climate, Energy and Utilities said in a statement.
Denmark's energy agency has, however, called for "higher levels of preparedness in the electricity and gas sector" in the country, Jorgensen said.
Russia said it was "extremely concerned" about the situation.
Asked by reporters whether it could be an act of sabotage, Kremlin spokesman Dmitry Peskov said that at the moment "it is impossible to exclude any options".
'Extremely rare'
The Danish energy agency said only the area where the gas plume is located will be affected by the leak, but methane escaping into the atmosphere has a "climate-damaging effect", according to the Ritzau news agency.
"Gas pipeline leaks are extremely rare and we therefore see a reason to increase the level of preparedness following the incidents we have witnessed over the past 24 hours," director of the Danish Energy Agency Kristoffer Bottzauw said in a statement.
"We want to ensure thorough monitoring of Denmark's critical infrastructure in order to strengthen security of supply in the future," he added.
Ola Westberg, spokesman for the Swedish Energy Agency, told AFP on Tuesday that no decision had been taken yet and that they "were in dialogue with Denmark."
Built in parallel to the Nord Stream 1 pipeline, Nord Stream 2 was intended to double the capacity for Russian gas imports to Germany.
But Berlin blocked newly-completed Nord Stream 2 in the days before the war.
Germany, which has been highly dependent on imports of fossil fuels from Russia to meet its energy needs, has since come under acute stress as Moscow has dwindled supplies.
Russian energy giant Gazprom progressively reduced the volumes of gas being delivered via Nord Stream 1 until it shut the pipeline completely at the end of August, blaming Western sanctions for the delay of necessary repairs to the pipeline.
'Targeted attack'
Germany has rebuffed Gazprom's technical explanation for the cut, instead accusing Moscow of wielding energy as a weapon amid tensions over the war in Ukraine.
Meanwhile, German daily Tagesspiegel reported that "the Nord Stream pipelines may have been damaged by targeted attacks and leaked as a result".
According to a source close to the government and relevant authorities, quoted in the newspaper, "everything speaks against a coincidence".
"We cannot imagine a scenario that is not a targeted attack," the source said.
The Nord Stream 1 leaks were first spotted Monday evening, hours after a drop in pressure was reported in Nord Stream 2, according to the Swedish Maritime Administration (SMA).
"Around 8:00 pm (1800 GMT) we received a report from a passing ship saying they saw something on their radar a little further north of the island of Bornholm," Fredrik Stromback, spokesman for the SMA, told AFP.
As a result of the leaks, navigational warnings have been issued for a distance of five nautical miles and a flight height of 1,000 meters (3,280 feet).
"The incidents on the two pipelines have no impact on the supply to Denmark," Jorgensen said.
(AFP)
