Staff from Shanghai's National Business Daily, including a deputy editor, were attacked by four employees from the maker of the popular Bawang shampoo, endorsed by celebrities Jackie Chan and Faye Wong, after the newspaper published several investigative reports that raised questions about its products. Hong Kong-listed Bawang International (Group) Holdings confirmed that the four men were company employees. The newspaper said none of its reporters or editors were injured. The National Business Daily said a manager from Bawang's Shanghai company took three men to the newspaper's Shanghai bureau yesterday afternoon and tried to attack reporters who wrote the stories. 'Four men claiming to be staff from the Bawang group burst into the National Business Daily's Shanghai office on July 30 without authorisation, and looked for the reporter who wrote a story about the company's shampoo containing carcinogens,' the newspaper said on its website. 'They threatened our reporters verbally, attacked and pushed and shoved them. The newspaper reported the matter to the police after failing to stop the four men from harassing the reporters. They were taken away by police for investigation.' Four pictures taken at the scene by the newspaper showed two angry young men shouting outside the newspaper's office and pointing their fingers at reporters. Deputy editor Feng Ming said the four men warned the newspaper to stop publishing negative reports about Bawang shampoo, saying that previous stories had led to a slump in sales. 'They burst into the office, kicked the door and pushed our staff after we rejected the request,' news portal Sina.com quoted Feng as saying. He said he was not injured and was helping the police investigation. 'The newspaper believes the media has the right to objectively and fairly report any public issue and ensure the public's rights to know,' the newspaper said. 'We strongly denounce such [behaviour] ... and reserve the right to take legal action.' Yang Zhengshu, a public relations manager from Guangzhou-based Bawang did not reply to inquiries yesterday. Chan Xing-tsing, a public relations manager from Porda International (Finance) PR Group which represents the Bawang group, confirmed that the four men were employees of the shampoo maker and declined further comment because the case was being investigated by the police. The National Business Daily published a story yesterday questioning Bawang's ability to treat and prevent hair loss, saying its boss, Chen Qiyuan, was bald. An earlier report claimed the company overstated its products' abilities in advertisements, had failed to register the shampoo with the State Food and Drug Administration, and that it could contain high levels of the cancer-causing agent 1,4-Dioxane. It was the second mainland business newspaper to be harassed by a company in a week. Last Friday, reporter Qiu Ziming from the Economic Observer was placed on a national online list of wanted criminals for 'alleged damage to a company's business reputation' after writing a series of reports about alleged insider trading at listed Zhejiang company Kan Specialties Material. Police later dropped his name from the list after it triggered a public outcry across the country.