TAIPEI, Taiwan—Two men were detained Saturday on suspicion of sexual assault in a case that shook Alibaba Group, the world’s biggest e-commerce company, Chinese police announced. The men, identified by the surnames Wang and Zhang, were suspected of the crime of “forcible molestation,” police in the eastern city of Jinan said in a statement. It said they were under “coercive measures,” a euphemism for detention. There was no evidence to indicate the men committed rape, a different charge under Chinese law, the police statement said. Alibaba was shaken last week after a female employee’s complaint on an internal company website that she was sexually assaulted by a manager surnamed Wang became public. The woman complained Alibaba failed to act after she reported the incident to its human resources department. The woman, surnamed Zhou, had flown into Jinan on July 27, the police statement said. That night and the following morning, …