On March 14, on the occasion of the 30th anniversary of the loss of Gac Ma (South Johnson Reef) in the East Sea (South China Sea) to China, many Vietnamese activists planned to hold commemoration for 64 naval soldiers who were killed by China's naval forces during the invasion of the island. In response, Vietnam's communist government applied many measures to prevent them from gathering. Security forces in Hanoi detained three activists namely Nguyen Thuy Hanh, Huynh Ngoc Chenh and Truong Van Dung and held them in a facility under the authority of the Ministry of Public Security. Police interrogated Hanh for hours and brutally beat Mr. Dung, breaking several teeths of Dung and causing many injuries to him before leaving him on a street near his private residence. Dung, who was hospitalized for treatment of the injuries, blamed security forces from confiscating his Iphone and a wallet with over VND3 million ($130). Many activists in Hanoi and Ho Chi Minh City said they were placed under house arrest as local authorities sent plainclothes agents to station near their private residences in a bid to prevent them from gathering together to mark the loss of Gac Ma.