Christchurch mosque shootings copycat crimes
On 15 March 2019, consecutive terrorist mass shootings took place at two mosques in Christchurch, New Zealand, carried out by Australian Brenton Harrison Tarrant. In total, 51 people were killed while another 89 were injured (40 by direct gunfire).
Source: Wikipedia — Christchurch mosque shootings copycat crimes (CC BY-SA 4.0)