MELBOURNE - The upcoming G20 summit will stick to its original security plan even though Australia has raised its terrorism alert level to high, Queensland premier said on Friday.

"There was always going to be a major security operation for the G20 in Brisbane," said Queensland Premier Campbell Newman, but added that the event has not made Brisbane a target.

According to a report of the local media AAP, Queensland deputy police commissioner Ross Barnett said police haven't received any specific intelligence of threats to the state.

"We would encourage the public not that change your plans ... and not feel unsafe about doing that," he was quoted as saying.

Two months ahead of the summit, Prime Minister Tony Abbott on the same day has raised the national terrorism public alert level from medium to high after receiving advice from the Australian Security Intelligence Organisation.

He said the advice was not based on knowledge of a specific attack plan, but rather on a body of evidence that points to the increased likelihood of a terrorist attack in Australia.