The two senior civil servants were reported to have been arrested and released on bail. So far most of the reports are highlighting their sexual indiscretions with the same woman and with some inkling on the awards of contracts through tenders. As far as I know, sexual misconduct is not a seizable offence. Correct me if I am wrong. It may be conduct prejudicial to the good image of an organization and may lead to a dismissal or demotion, definitely no arrest is warranted.
Why were the two men arrested? I think the more serious offence is money related, some kind of corruption. Can’t imagine anyone being arrested for sexual misconduct. I think Changi would not be big enough to accommodate them all.