WASHINGTON – The brother-in-law of alleged terrorist co-conspirator Sami al-Arian attended engineering classes at the same college and time as the suspected mastermind behind the Sept. 11 terror plot, records at the North Carolina college show. The overlap raises questions about the extent of al-Arian's ties to terrorist groups. He and his brother-in-law, Mazen al-Najjar, have been accused by federal authorities of supporting Hamas, a Palestinian militia responsible for anti-Israeli suicide bombings, through an elaborate network of terrorist front groups and fund-raising arms. Mazen al-Najjar Al-Najjar, a Palestinian refugee, was arrested in 1997 and deported last year. Al-Arian, who also...