Update (0730ET): China Eastern has decided to halt all flights involving Boeing 737-800s, the model that was involved in Monday's crash, starting Tuesday. An emergency telephone assistance line for family was set up, and the airline expressed "deep condolences" to passengers and crew members onboard.

China Eastern's website, mobile app and some of its social media platforms were turned to black and white in a sign of mourning. President Xi Jinping urged rescue efforts following the crash, state TV reported.