The New Zealand leader's promise of tightened gun laws in the wake of the Christchurch mosque shootings has been widely welcomed by a stunned population. Prime Minister Jacinta Ardern told TVNZ that her Cabinet will consider the details of the changes on Monday. She has said options include a ban on private ownership of semi-automatic rifles that were used with devastating effect in Christchurch and a government-funded buyback of newly outlawed guns.