Two people have been charged after allegedly threatening Labor Senator Kristina Keneally online. 

In a statement, the Australian Federal Police said a 29-year-old man from Sydney's west and a 41-year-old woman from Maitland in the Hunter region have been served court attendance notices. 

"[This action was taken] following threats made against an Australian Senator via a social media messaging service," the AFP said. 

"It will be alleged in court that the man and woman were responsible for sending two separate threatening messages on 23 November 2021 which threatened or advocated violent acts."

Senator Keneally confirmed she was the senator police had referred to in the statement. 

"I would like to thank the Australian Federal Police (AFP) who in all matters relating to safety and security of members and senators take their responsibility seriously," she told Sky News. 

"I think it goes to a broader issue that has been discussed by the AFP in Senate estimates and other forums.

"That is right now, in our political debates and discourse, unfortunately we are seeing an increasing trend towards extremist views and threats of violence."

AFP Commissioner Reece Kershaw revealed in November last year that his officers were investigating threats made against politicians and that a review of politicians' safety in general was underway.

It followed concerns raised by MPs and senators about their safety, after the murder of British Conservative MP Sir David Amess.

Last month, the AFP Commissioner also warned he expected threats against politicians to increase at the coming federal election.

Senator Keneally would not comment on what was in the messages sent to her, however she indicated the matter was not an isolated one. 

"Because the matter is before the court I won't go into the content or circumstances," she said. 

"I am aware quite regrettably of several circumstances of members of parliament who are backbenchers or frontbenchers who have been on the receiving end of threats."

AFP investigators have carried out a search on the homes of both the man and woman.

The 29-year-old has been charged with threatening to cause harm to a Commonwealth public official, while the 41-year-old has been charged with using a carriage service to menace, harass or cause offence.

They will both face Sydney Central Local Court next month.