Swedish authorities arrested a man on Wednesday who is accused of obstructing an investigation into fires set at Jewish institutions in Massachusetts. A federal grand jury in Boston indicted Alexander Giannakakis, 35, on five charges related to falsifying information in relation to domestic terrorism, concealing records in a federal investigation, and tampering with documents and an official proceeding, according to a statemen t from the U.S. Attorney's Office of the District of Massachusetts. Giannakakis was arrested in Sweden at the request of the U.S., which is now planning to seek his extradition so he can face charges in Boston. Giannakakis...