Australia’s federal government has declared Sunday, December 21 as a Day of Reflection for the victims of the terror attack in Sydney, in which 15 people were killed, Prime Minister Anthony Albanese announced.

Speaking to reporters Friday, the premier asked the country’s citizens to observe a one-minute silence on Sunday in memory of the casualties of this attack.

“On Sunday, flags on all New South Wales and Australian Government buildings will be flown at half-mast. As a mark of respect for the lives lost and the grief shared across our nation, we invite people across Australia to light a candle at 6:47pm, exactly one week since the attack unfolded, as a quiet act of remembrance with family, friends or loved ones,” Albanese said, in particular.