Chinese Foreign Ministry spokeswoman Hua Chunying said at a regular news briefing that the matter is an internal affair and the EU should refrain from interfering in matters concerning the former British colony.
"Matters related to Hong Kong are purely China's internal affairs. No external forces should interfere," Hua said. "We urge the European side to watch their words and acts and to halt immediately the interference in Hong Kong affairs."
The case is "the most serious challenge" to Hong Kong's political autonomy, the report said.
Chinese authorities have been investigating the booksellers for selling banned politically themed books to customers in mainland China.
Two of them, Gui Minhai and Lee Bo, may have been abducted and taken to mainland China for investigation, raising concerns that Chinese agents might have overstepped in law enforcement.
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