Around 300 employees at a company in Beijing have been detained on suspicion of illegally sourcing personal data to make a profit.

The suspects, from Tistina International Collection, are accused of using the data to off-load inferior collectibles, such as memorial coins and stamp albums, at high prices.

Around 300 officers were sent to raid the company's office in Fengtai district on Wednesday, Beijing Public Security Bureau said in a statement on Saturday.