I think it was because of the news that China governments and regulatrary agency has shut down mining activities. Many traders and investors see this a good news and since this is going to lower supply they believe that it is time to invest because price is going to surge.
You are all that are always thinking that China has so much influence in Bitcoin price should really stop. China is just a country that have citizens interested in cryptocurreny just like every other country.
Every actions they take don't have major impact on Bitcoin price. Whether they shut down an exchange or open an exchange, it won't be affecting Bitcoin and also same to other countries. Price of Bitcoin can be affected by market activities, adoptions and circulation.