Around 2.45pm police were called to a Moon Street, Caboolture South address in relation to reports of a man having sustained a stab wound.
This man has been transported to hospital in a serious condition.
Around 2.50pm a two vehicle crash occurred on nearby River Drive, Caboolture South.
This crash involved a police vehicle, responding to the Moon Street incident and a man connected to that incident.
Three police personnel were injured and have been transported to hospital.
The male driver of the other vehicle was also injured and transported to hospital.
Police investigations into both incidents are continuing.
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