An 81-year-old woman has died after being hit by a vehicle in Christchurch.

The woman died at the scene after a vehicle hit her at about 2pm in a hotel carpark in Deans Ave.

In a separate incident, a second person also sustained serious injuries when they smashed into a commercial building on Antigua St at about 2.20pm.

The Serious Crash Unit has been advised of both crashes, and police say they are working to determine the circumstances.

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"There is no disruption to traffic at this time and further information will be released about these incidents when possible," police say.