THE gunman who carried out the Tucson, Arizona, massacre has refused to say anything to police since he was taken into custody.

The gunman who carried out the Tucson massacre in the US has refused to say anything to police since he was taken into custody.

The man accused of attempting to assassinate US congresswoman Gabrielle Giffords in a gun rampage that killed six people will appear in an Arizona court today.

Congresswoman Gabrielle Giffords remained heavily sedated and in a critical condition today as investigators sought to understand what motivated a gunman to carry out the assassination attempt in a rampage that left six people dead.

An assassination attempt has left a Democratic congresswoman in a critical condition, killed Arizona’s chief federal judge and five other people and forced Americans to question the toxic legacy of their divisive politics.