Christchurch police are asking for information about an attempted robbery and two separate assaults during the weekend.
A spokesperson said an armed intruder attempted to rob Robbies Bar and Bistro in suburban St Albans just before 10pm on Sunday, but a staff member was able to shut them out.
The man was carrying a shotgun and police wanted to hear from anyone with information.
They also wanted information about a serious assault in Riccarton early on Sunday morning which left a 19-year-old man in a serious but stable condition in Christchurch Hospital's intensive care unit.
On Saturday afternoon, a 44-year-old man and a 41-year-old woman were allegedly assaulted by a group of people on a suburban Wainoni property, the spokesperson said.