Heavily armed rapid response police will soon become commonplace at Adelaide Oval and other major events.

Police say it is a necessary form of 'intimidation' to fight any threat of terror head-on.

"This will be a change in the look of what people see at events in South Australia," Premier Steven Marshall said.

A new rapid-response police unit has been allocated more than $9 million over four years, with officers pre-deployed with semi-automatic rifles and trained in bomb appraisal.

The highly visible, specially trained force will target at-risk crowded places and respond to violent incidents, such as a terrorist attack, in support of first responders.

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Members of the force will also receive advanced training in some tactics traditionally only provided to Special Tasks and Rescue Group (STAR) operatives.

Their presence will be paid for with new budget money - not charged to venue operators.

The budget also has funding for a fixated threat team to boost state defences against anyone with extremist violent intent.

The team will work with SAPOL to mitigate the threat of mass casualty terrorism by providing advice and accompanying police when assessing potential extremists.

“It is vitally important for SAPOL to be able to react quickly and decisively to any terrorism threat and this new overall Rapid Response capability will be able to do just that,” Police Minister Corey Wingard said.

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