Two men in northern England are being questioned as part of an anti-terrorism operation after a substance suspected of containing the deadly poison ricin was found in a house.
The men, a a father and son aged 41 and 18, were arrested on suspicion of being involved in a white supremacist group.
The ABC reports ricin can cause death from exposure to as little as a pinhead amount. Most victims die between 36 - 72 hours after exposure and there is no known antidote.
Police say the substance, found in a sealed jam jar in the kitchen of the house in northwest Durham, could have been there for up to two years.