Four people have been injured in a central city crash in Christchurch.

A police spokesman said police received a report of a two vehicle collision on Manchester Street at around 11.15AM.

The road was blocked for a short time while emergency services attended.

A St John ambulance spokeswoman said two ambulances and an operations manager responded to the scene.

Ambulance officers treated and transported three patients in a moderate condition to Christchurch Hospital.

In addition, they assessed one patient at the scene in a minor condition.