"Government departments, including public security, fire protection, traffic emergency response, development and reform, keep strengthening market supervision and protection to deal with problems in a timely manner," the letter said.

"Thanks for your enthusiastic publicity. All the short videos and travel articles you post online are the best promotion for Heilongjiang. Your likes and comments are also the greatest encouragement to Heilongjiang, which can make more know the province's unique scenery, high-quality products and its warmhearted residents," the letter said.