A Chinese company that makes shoes for Ivanka Trump and other brands denied allegations on Thursday of excessive overtime and low wages – accusations made by three activists who have been arrested or disappeared.

The Associated Press reported on Tuesday that Hua Haifeng, an investigator for China Labor Watch, a New York-based not-for-profit group, had been arrested on a charge of illegal surveillance while his two colleagues – Li Zhao and Su Heng – are missing and rights groups fear they have been detained. They were investigating Huajian Group factories in the southern Chinese cities of Ganzhou and Dongguan.

Activists investigating Ivanka Trump's China shoe factory detained or missing Read more

“We are shocked,” Long Shan, a spokeswoman for the Huajian Group, said in an email to the Associated Press. “As a renowned global media outlet, you have put out many untrue reports not based on facts and without our consent.”

China Labor Watch executive director Li Qiang said on Thursday he still had not been able to confirm the status of the two men. Huajian was contacted before AP’s initial reports were published but issued no statement until Thursday.

Long said the company had stopped producing Ivanka Trump shoes months ago. She said Hua Haifeng had joined the group’s factory in Dongguan on 20 May, but left after less than a week, and Su Heng began working at their Ganzhou factory on 28 April, but also left after a short time. She said she did not know their current whereabouts.

“By coming to Huajian to work, they are Huajian employees. Huajian staff must comply with China’s laws and regulations and Huajian’s rules,” she said, adding that at least one of the men “used methods like taking photographs and video to obtain the company’s trade secrets, which is not in line with the company’s regulations. Our company has the right to hold him accountable.”

She said reports of managers verbally abusing workers, including insults and a crude reference in Chinese to female genitalia, were based on misunderstanding. “It is the local dialect being used as management language,” she said.

She said Huajian was looking into allegations of improper use of student interns.

Ivanka Trump’s brand declined to comment on the allegations or the arrest and disappearances.

Marc Fisher, which produces shoes for Ivanka Trump and other brands, said it was looking into the allegations.

China Labor Watch has been exposing poor working conditions at suppliers to some of the world’s best-known companies for nearly two decades, but Li said his work has never before attracted this level of scrutiny from China’s state security apparatus.

The arrest and disappearances come amid a crackdown on perceived threats to the stability of China’s ruling Communist party, particularly from sources with foreign ties such as China Labor Watch. Faced with rising labor unrest and a slowing economy, Beijing has taken a stern approach to activism in southern China’s manufacturing belt and to human rights advocates generally, sparking a wave of critical reports about disappearances, public confessions, forced repatriation and torture in custody.