sentences:  Following a peaceful demonstration of Viet Tan party members in Hanoi to affirming Vietnamese sovereignty over the Paracel and Spratly Island, Mrs. Hong Vo, a 53-year-old social worker from Melbourne, Australia was arrested in the evening of October 10, 2010.The arrest occurred at the airport, as Mrs. Vo was boarding a plan to return to Australia.Her son was on a phone call with her, when the phone call ended abruptly.