In response to the aggressive signals received from "Kattegat", Seip signalled back a short message telling the German crew to abandon ship within 10 minutes or face the consequences. At the end of the ten minutes no reaction from the German crew had been observed and "Nordkapp" fired a warning shot. As still no reaction could be seen in the protruding darkness, four 47 mm rounds were fired into "Kattegat's" waterline. As the Germans had opened their ship's valves while leaving the tanker, "Kattegat" sank quickly. Thirty-four of the crew were brought on board "Nordkapp" as PoWs from a nearby wharf, while the remaining five managed to escape into the hills after their ship was sunk. The 34 PoWs from the German tanker were brought to Mosjøen and handed over to military authorities there.