Police have denied reports that a stampede at New Year's Eve celebrations in Shanghai was caused by people rushing to pick up fake money thrown from a building.
At least 36 people died in the incident, authorities have said.
The government in China's business capital said large crowds started to stampede on Chen Yi Square, in the riverside area known as the Bund, just before midnight.
It was the worst disaster in the cosmopolitan city since 58 died in an apartment building fire in 2010.
The cause of the crush has still to be confirmed.
However, state media and some witnesses have said it was at least partly triggered when people rushed to pick up coupons that looked like bank notes.
A man named Wu, who brought one of the 47 injured to hospital for treatment, said the fake money had been thrown down from a bar above the street as part of the celebrations.
However, Shanghai police said on their official microblog that while closed-circuit television footage did show some bills had been thrown from a bar in a building, which a small number of people picked up, this did not cause the crush.
"This incident happened after the stampede," police said in a brief statement, without saying what the real cause was.
Another witness, who gave his family name as Wei, said there had been a problem away from the area where the fake bills were thrown, with people trying to get on to a raised platform overlooking the river.
Xinhua news agency said that people had been trampled on after falling down on the steps up to the platform.
"We were caught in the middle and saw some girls falling while screaming. Then people started to fall down, row by row," a witness surnamed Yin told Xinhua.
Some Chinese media outlets carried criticism of the authorities for lack of adequate policing and planning.
Police officer Cai Lixin said they did not have a large presence on the Bund as there were no formal New Year events planned, Caixin magazine said.
Foreign media were forbidden from attending a police press conference, underscoring government sensitivity about any critical coverage of disasters.
State media said many of the dead and injured were students, and 28 of the dead were women.
Authorities had shown some concern about crowd control in the days leading up to New Year's Eve.
They recently cancelled an annual 3D laser show on the Bund, which last year attracted as many as 300,000 people.
On New Year's Eve, Beijing also cancelled a countdown event in the central business district, Chinese media said, due to police fears about overcrowding.
President Xi Jinping has asked the Shanghai government to get to the bottom of the incident as soon as possible.
He ordered governments across the country to ensure a similar disaster could not happen again, state television said.
The Shanghai government said on its official microblog that an inquiry had begun, and that all other New Year events had been cancelled.
