The Linwood Mosque is cordoned off on March 21, six days after a shooter killed 51 people there and at another mosque in total in Christchurch, New Zealand (XINHUA)

Fifty-one people were killed and another 50 injured in shootings at two mosques in Christchurch, New Zealand, on March 15, marking the worst acts of violence in the country in nearly three decades. Shooter Brenton Tarrant posted a 74-page, hate-filled screed online, and then live streamed the killings on Facebook. His Twitter account was filled with anti-Muslim and anti-immigrant rhetoric.

New Zealand's Prime Minister Jacinda Ardern vowed to change her country's gun laws after the terrorist attacks. UN Secretary General António Guterres urged the international community to stand united against anti-Muslim hatred.