letter containing a threat to behead Tasmanian senator Jacqui Lambie unless she helps implement Sharia law in Australia has sparked a security assessment at the outspoken independent's office.
The letter was received at the senator's Burnie office last week and included threats to behead the former Palmer United Party member unless she converted to Islam and helped implement Sharia law by March 18.
It was accompanied by graphic images of a man being beheaded, which prompted the senator's office to treat the threats seriously.
"By the powers invested in me by Allah, I sentence you to death," the letter said.
"I will take the honour in beheading you ... when you are least prepared; my men and I will take your office by surprise."
Senator Lambie has been a vocal critic of Islamic Sharia law, but she said the death-threats would not deter her.
"I have no doubt that it is my stance against Sharia Law and my questions on Halal that are going on at the moment," she said.
"The bottom line is that we are at war with ISIS and we are just going to have to be extremely cautious."