HONG KONG (MarketWatch) -- Hong Kong shares took a beating early Monday after a retreat on Wall Street, with resource stocks edging lower on softer commodity prices, while property stocks slid amid worries about monetary tightening in China. The Hang Seng Index fell 2% to 20,951.78, and the Hang Seng China Enterprises Index fell 1.9% to 12,024.80. Aluminum Corp. of China Ltd. /quotes/comstock/22h!e:2600 (HK:2600 8.14, -0.25, -2.98%) /quotes/comstock/13*!ach/quotes/nls/ach (ACH 26.77, +0.89, +3.44%) dropped 3.2%, PetroChina Co. /quotes/comstock/22h!e:857 (HK:857 8.95, -0.26, -2.82%) /quotes/comstock/13*!ptr/quotes/nls/ptr (PTR 116.68, -0.67, -0.57%) lost 2.7% and heavyweight HSBC Holdings Plc. /quotes/comstock/22h!e:5 (HK:5 79.45, -1.45, -1.79%) /quotes/comstock/13*!hbc/quotes/nls/hbc (HBC 51.17, -1.02, -1.95%) shed 2.2%, while China Overseas Land & Investment Ltd. /quotes/comstock/22h!e:688 (HK:688 16.46, -0.50, -2.95%) gave up 3.3%. China's Shanghai Composite, meanwhile, rose 0.3% to 3,076.16