Before revision:  Our results suggest that the disease propagation is highly related to population migration from Hubei resembling a L\'{e}vy flight which is characteristic of human mobility . Our results also suggest that the disease spread in a city in China is characterized by two-stages process.
After revision:  Our results suggest that the disease propagation is highly related to population migration from Hubei resembling a L\'{e}vy flight which is characteristic of human mobility and thus could be controlled by efficient quarantines. Since quarantine is usually applied on a city level, more insight can be obtained in analyzing the epidemic in cities. Our results suggest that the disease spread in a city in China is characterized by two-stages process.