Hong Kong stocks plunged to near four-year lows in the morning session Wednesday, hit by concerns about the state of China’s economy, while falling oil prices hammered energy firms.

The Hang Seng Index dived 3.77 percent, or 740.93 points, to 18,894.88 — levels not seen since early 2012.

Photo: ECNS.

The benchmark Shanghai Composite Index slid 1.37 percent, or 41.08 points, to 2,966.66, while the Shenzhen Composite Index, which tracks stocks on China’s second exchange, lost 1.16 percent, or 21.97 points, to 1,873.78.

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