Is it normal that the cops want to talk to you for ??? reason

I was on the red line of the MRT on the morning of 11 October when I received a call from a number I didn't recognise. When this happens, I tend to assume that it's either one of two options: (1) a scam call, or (2) the police. Still, a small part of me always worries that it might turn out to be the family member of a death row prisoner, or a friend or family member borrowing a phone in an emergency situation, so I answered the call.

Jokes on me. It was the police.