A subway train in China's commercial center of Shanghai has smashed into the back of another train, injuring dozens of people.
Local reports say the accident Tuesday on Line 10, one of the city's newest lines, may have been caused by problems with the signaling system, similar to a crash in July on one of China's high-speed train lines.
Shanghai TV says more than 100 people were taken to hospitals for treatment. The exact number of injuries could not be immediately confirmed.
Shanghai, a city of 23 million, has rapidly expanded its subway system in recent years. Some lines have had problems with faulty signaling, doors not opening properly and poorly trained operators.