Upstairs morons having a house party

Anyone know who to all about this gathering when we’re all suppose to be isolating?

Edit: Thanks for all the replies and advice. Whatever they were doing only lasted about a 1/2 hour so I felt calling the cops would have just had them coming out to an empty or almost empty apartment. Next time I’m going to be Johnny on the spot with that non emergency number and not delay. Thanks again everyone and stay safe, stay healthy!