This article examines the impact of the March 15, 2019 far-right terrorist attack against Muslims in Christchurch, New Zealand on public opinion toward Muslims. It also examines whether the impact of the attack varies for individuals across the political spectrum. We make use of data from the 2019 New Zealand Attitudes and Values Study (N = 47,951) to compare the attitudes of New Zealanders before and after the attack. Using a range of statistical techniques, including regression discontinuity analysis, we find robust evidence that the attack led to an immediate increase in warmth toward Muslims. We also show that this increase was driven by both left-wing/liberal and right-wing/conservative individuals in the immediate days after the attack. Soon after the attack, however, attitudes toward Muslims among the politically conservative population tended to revert to pre-attack levels. By contrast, political liberals maintained their heightened level of positive attitudes for a longer period. We discuss the possible theoretical reasons for these findings.