Dutch police arrested 12 Somalis on Christmas Eve on suspicion of plotting an imminent terrorist attack in the Netherlands.The alleged plot was uncovered in a country seen as a potential target for militants over its former military role with NATO forces in Afghanistan and due to the growing influence of an anti-Muslim party at home.Twelve men aged between 19 and 48 were arrested late on Friday after a message was received from the Dutch intelligence and security service AIVD, prosecutors said in a statement.Somalis were the largest sub-Saharan asylum group in the Netherlands, most often unemployed, and young men aged between 15 and 25 were relatively often involved in criminal activities, a study commissioned by CBS found in 2005.