People mourned the victims of the Tangshan earthquake in front of the Victim Memorial Wall on July 28, 2015 to mark the 39th anniversary of the deadly disaster in Tangshan, Hebei province, China.

39 years ago, on July 28 at 3:42am local time, a 7.8 magnitude earthquake shook the unprepared city and killed 242,000 people and injured over a million . The causalities were considered the biggest in the 20th century world history.

Today the city has been well restored, but people cannot forget the past. Here are some pictures to show the memorial services held in this city.

A resident pastes a paper flower beside the name of his relative dead in the 1976 Tangshan earthquake in front of the memorial wall in Tangshan, north China's Hebei Province, July 28, 2015. Local residents came to the memorial park on Tuesday to commemorate the 39th anniversary of the Tangshan earthquake. (Photo: Xinhua/Li Junyi)