Justin Bieber on Sunday scolded fans for defying a moment of silence at his Buffalo, New York, concert to remember the supermarket mass shooting victims there.

Just hours after 10 people were killed in what authorities described as a racist hate crime at a Tops Friendly store, Bieber took the stage Saturday and asked the sold-out KeyBank Center crowd to pay tribute to those who were slain. (Watch the video below.)

As you know, theres been tragedy in the city, but what were gonna do tonight, is were gonna honor those people, and I would love if we could just take a moment of silence, he said in a clip he posted to Instagram. That would mean a lot to me.

Most of the fans were respectful, but a few could be heard rudely shouting or screaming. Bieber expressed his dismay in a brief message.

To the people who couldnt stay silent to honor the lives that were so tragically lost, I urge you to ask yourself why? he wrote.