Forty-nine people were killed in shootings at two mosques in central Christchurch, New Zealand, on Friday, in a terrorist attack that Prime Minister Jacinda Ardern described as “an extraordinary and unprecedented act of violence.”

• Officials said that one man in his late 20s had been charged with murder, and that two explosive devices were found attached to a vehicle that they had stopped.

• A Muslim leader in New Zealand said the attack was especially shocking as it took place around Friday Prayer. The police urged people to stay away from the mosques until further notice.

• A video and manifesto that appeared to be by a gunman involved in the shooting were posted online on the day of the attack.