MADRID, March 12 (Reuters) - Spanish police have arrested a Canadian man suspected of helping finance Islamist military operations, the interior ministry said on Monday. The 61-year-old man, named as Brian David Anderson, is wanted by U.S. authorities for fraud amounting to more than $20 million and is believed to have helped finance a training camp in Afghanistan, the ministry said in a statement. It said Anderson was thought to be linked to Abdul Tawala Ibn Ali Alishtari, a New York businessman who has been indicted on terrorism charges in the United States and is also accused of funding Afghan military projects.