Thu, 22 Dec 2011 12:00:01 +0100 (AP) - Cargo ship M/S Thor Liberty at the Mussalo harbour in Kotka, Finland Thursday Dec. 2 2011. Finnish authorities on Wednesday impounded 160 tons of explosives and 69 surface-to-air missiles found on the British-flagged cargo ship ultimately destined for Shanghai, China, officials said. The M/S Thor Liberty sailed from the north German port of Emden on Dec. 13. Investigating officers didn't know the origin of the Patriot missiles or who was supposed to receive them. (AP PhotSari Gustafsson FINLAND OUT. NO THIRD PARTY SALES