China ordered developers not to take deposits for sales of uncompleted apartments without proper approval and barred them from charging “abnormally high” prices, stepping up efforts to prevent a property bubble.

Developers must disclose to the public all apartments available and prices, and start selling within 10 days of getting pre-sale approval, the Ministry of Housing and Urban- Rural Development said in a statement on its Web site today. It vowed to punish developers that “artificially” create supply shortages.