A man was arrested last weekend after he was accused of making a bomb threat using a fake email address last year that targeted staff of the Superior Courthouses of Middlesex County, authorities said. Tiago Santana-Silva, 30, of Elizabeth was charged Sunday with second-degree false public alarm as well as of third and fourth-degree terroristic threats, according to a joint statement from the Middlesex County Prosecutor’s Office, Middlesex County Sheriff Office and the New Brunswick Police Department. The threat was made on Oct. 25 and concerned the courthouses located at 50 Paterson Street and…