The Swedish coast guard said in a statement that the 182-metre (597-foot) ship was flying a Syrian flag, and “likely” had no cargo.
“Its destination is unknown,” it said.
“A preliminary investigation is underway regarding unseaworthiness, a violation of the maritime code,” it added.
On April 29, Sweden confiscated a shadow fleet cargo ship, the 96-metre Caffa, which it had seized on March 6 on suspicion of transporting stolen Ukrainian grain.
The confiscation followed a request for “legal assistance” from a foreign state, a Swedish prosecutor said, refusing to disclose the country.
On March 12, Sweden’s coast guard also boarded the 228-metre tanker Sea Owl I off Trelleborg.
The Sea Owl I was flying a Comoran flag, which the coast guard believed was phoney.
