Helen Haines loses leg in horror attack

On Monday afternoon, Victorian man Brendan Nugent, 43, allegedly used a white Toyota LandCruiser to strike independent MP Helen Haines twice.

The 65-year-old member for Indi in regional Victoria is in critical condition with devastating injuries. The Prime Minister says it was a deliberate act.

Today, 7.30 political editor Jacob Greber on what we know and why the alleged attack is a wake-up call as threats of political violence surge.

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Jacob Greber, ABC TV's 7.30 political editor