[1][2] Shortly before 1.30 AM on May 19, 2009, the HSwMS Malmo and HSwMS Stockholm[3] were ordered to respond to a mayday signal sent out by the Greek cargo ship M/V Antonis, the crew of the cargo ship had said that they came under rocket-propelled grenade fire from the pirates.

[4][6] In response, the pirates reportedly fired a grenade launcher, but spokesman Anders Grenstad claimed nobody was injured.

[7] When the pirates attempted to escape, the HSwMS Malmö began chasing them, and focusing on one of their boats.

[6][4][1] The 7 pirates on board one of the fishing boats were arrested and taken onboard the HSwMS Malmö while security forces boarded the fishing boat and documented the items, finding 2 guns, a GPS navigator, and a grappling hook.

[4][5][9] After the Swedes interrupted the attempted hijacking, there were fewer pirate attacks in the area, making Magnus Jönsson to say that he believed the Swedish intervention had some impact.