Jaba,
Definitely not listed in the regs as one of the prohibited items. That's not to say however that after the events of the last week in Sydney and subsequent emergency meetings with CASA, Dept of Infrastructure and state and federal police that immediate direction to screening authorities to ban the items has been given.
On the other hand, could be just another over zealous security screener who took it upon himself or herself to do their bit for aviation security after seeing the news on TV.