China's Sinopec Group, the parent of Sinopec Corp, has ordered the closure of three plants, including two refineries in the southern province of Guangdong, for environmental checks, the company said in a statement.

The two refineries are Sinopec Guangzhou Petrochemical Corp and Sinopec Dongxing refinery, with a combined crude processing capacity of 370,000 barrels per day (bpd).

Sinopec announced the order late on Wednesday after Chinese state television reported the plants, which also includes a small petrochemical plant, had environmental problems.

Sinopec did not specify the problems at the plants or the length of the shutdown.