Group 1 - The core message of the article is that both China CRRC and China First Heavy Industries have issued warnings about illegal activities where fraudsters are impersonating their companies to conduct investment scams through fake apps [1][2]. Group 2 - China CRRC has identified fraudulent apps named "China CRRC," "China CRRC," and "CRRC Wind Power" that promote high-return investment schemes, which are not affiliated with the company [1]. - The company emphasizes that it has not authorized anyone to disseminate investment information or links to such apps and urges the public to be cautious and report any losses to the police [1]. - Similarly, China First Heavy Industries has reported that fraudsters are using a fake app called "Yizhong Convenience" to engage in illegal activities, and the company has no connection to this app or its operations [2]. - Both companies have taken legal action by reporting these fraudulent activities to law enforcement [2].