A highly anticipated press briefing by China's top economic planner fell short of expectations.

Shares soared Tuesday in Shanghai as Chinese markets reopened after a weeklong holiday but then gave up a chunk of their initial gains as officials in Beijing outlined details of plans to revive the world's second-largest economy.

Chinese stocks listed onshore suffered their biggest drop in more than four years as traders grew impatient over the pace of Beijing’s stimulus measures and weak holiday-spending data hurt sentiment.