Police officers escort a prison van carrying Tong Ying-kit, the first person charged under the new national security law, as he leaves West Kowloon Magistrates’ Courts, in Hong Kong, China July 6, 2020. — Reuters pic

HONG KONG, Sept 25 — A student arrested in Hong Kong on suspicion of selling weapons online faces charges of inciting secession under a security law imposed on the city by China three months ago, a senior police officer said today.