New Zealand's prime minister vowed Saturday to toughen the country's gun laws after revealing the alleged shooter behind Christchurch's mosque attacks had legally bought the five weapons, including two semi-automatic rifles, used in the massacre. The nation's firearms laws are lax compared to neighbouring Australia, which enacted a strict gun control regime in the wake of a similar massacre in 1996. Jacinda Ardern said 28-year-old Australian Brenton Tarrant obtained a "Category A" gun licence in November 2017 which allowed him to purchase the weapons used to mow down worshippers in two Christchurch mosques.