HONG KONG (Reuters) - The Hong Kong-listed shares of property developer China Vanke were set to fall 8.4% on Friday after state media reported that Chief Executive Zhu Jiusheng was detained by Chinese public security authorities this week.

The Economic Observer reported on Thursday that Zhu had been detained and a Shenzhen government task force had stepped in to oversee the property developer's operations. Vanke did not respond to a request for comment.

The Hong Kong shares of China Vanke were set to open at HK$4.45 ($0.57), the lowest open since late September.

($1 = 7.7881 Hong Kong dollars)