Live updates: Helen Haines reportedly loses leg; AFP says attack 'isolated incident'

Good morning, everyone. You're here with Alexandra Koster as we take you through the latest updates on the attack on independent MP Helen Haines .

Haines remains in critical condition in a Melbourne hospital after she was allegedly deliberately struck by a car outside her electorate office in Victoria's north-east on Monday afternoon.

A 43-year-old man is in custody, and counterterrorism authorities have joined Victoria Police in investigating the incident.

There will be a lot of moving parts today — and we'll be taking you through them live.