DARTMOUTH, MA --A University of Massachusetts Law School student wanted in Texas has been arrested on firearms and assault charges. John Ethan Cassidy of Spring, Texas was ordered held pending a dangerousness hearing at his arraignment Thursday in New Bedford District Court. He pleaded not guilty to charges including possessing firearms without the proper permits. Police say the 26-year-old first-year law student was arrested Wednesday. Police who searched his apartment in Dartmouth say they found an AK-47 and a 9 mm handgun as well as hundreds of rounds of ammunition. Police also allege he assaulted his roommate. Cassidy is under suspicion in Texas for possessing explosive components. His lawyer said the guns were bought legally in Texas and Cassidy was in the process of applying for permits in Massachusetts.