(Bloomberg) -- The Danish military is staying near a Chinese ship that may be linked to damaged data cables in the Baltic Sea.

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A high-speed fiber optic cable connecting Finland and Germany was cut early Monday by what was likely an external impact and a nearby link between Lithuania and Sweden was damaged on Sunday. It was the second such incident in the Baltic Sea in just over a year.

The bulk carrier, Yi Peng 3, was in the vicinity of the cables when they were damaged, data compiled by Bloomberg show. It has been anchored in the northern part of the Danish straits since Tuesday, with Danish Navy diving ship Soloven close by.

“We are present in the area near the Chinese ship Yi Peng 3,” the Danish armed forces said in a post on X. The military stopped short of linking the ship to the cable incident, and said they had no further comments.

Defense Minister Troels Lund Poulsen called the situation “serious,” adding that it’s not certain that the ship is connected with any acts of sabotage. He declined to provide any details about the Danish military’s interaction with the ship.

Yi Peng 3 had departed Russian port Ust-Luga on Friday. While vessels sometimes stop for refueling at sea, its current location near Denmark is not a typical site for such activity.

The incidents are being probed by Swedish police as possible sabotage, and German Defense Minister Boris Pistorius on Tuesday said the events have to be investigated as such an act.

Lin Jian, a spokesman for the Foreign Ministry in Beijing, said on Wednesday that “China always fully fulfills flag state obligations and asks Chinese vessels to strictly abide by relevant laws and regulations.”

“We also attach great importance to protecting the safety and security of infrastructure,” he said, adding that China works “with the international community to vigorously advance the construction and protection of global information infrastructure including undersea cables.”

Germany has already stepped up patrols around its northern coastal areas due to the 2022 attack on the Nord Stream gas pipelines and protecting critical infrastructure is a top priority, Interior Ministry spokesman Cornelius Funke said at a news conference in Berlin.

The Swedish navy is conducting an investigation of the seabed to see what may have happened, spokesman Jimmie Adamsson told newspaper Goteborgs-Posten.