BEIJING (Reuters) - China's manufacturing activity fell in January, an official factory survey showed on Monday.

The official purchasing managers' index (PMI) contracted to 49.1 in January from 50.1 in December, below the 50-mark separating growth from contraction and missing a median forecast of 50.1 in a Reuters poll.

(Reporting by Liz Lee, Yukun Zhang and Joe Cash; Editing by Sonali Paul)