What we know about the attack on Helen Haines

Indi MP Helen Haines is in a critical condition in a Melbourne hospital after being "attacked" near her electorate office in Wangaratta, north-east Victoria.

Prime Minister Anthony Albanese is leading cross-party condemnation of the incident, as he reveals counter-terrorism police are investigating.

Victoria Police said a 43-year-old Tarrawingee man has been arrested following the incident.