NEW : Police are investigating the threat to three Chinese airlines . Shenzhen Airlines said that a flight from the eastern city of Nanjing returned to its point of departure , a flight from Xi'an changed course to land in the southwestern city of Guilin , and a flight from Beijing departed late after police talked to passengers . Five different flights to the southern city of Guangzhou are affected . Two flights are rerouted and two are delayed . The state - run news agency says the airlines have ` ` false bomb threats ''
NEW : Police are investigating the threat to three Chinese airlines . Five different flights to the southern city of Guangzhou are affected . Two flights are rerouted and two are delayed . The state - run news agency says the airlines have ` ` false bomb threats ''