BEIJING (AP) — Police have arrested the brother-in-law of China’s jailed Nobel Peace Prize winner Liu Xiaobo on fraud charges in what the family said is the latest act of official retaliation.

Beijing police detained Liu Hui on Jan. 31, just before the Lunar New Year and a planned family reunion, and formally charged him two weeks ago over a real estate dispute, lawyer Mo Shaoping said Thursday. He said the criminal charges were unwarranted in a business dispute that has since been resolved.