A series of leaflets allegedly linked to threats by the pro-Palestinian hacktivist Handala group to target Israel's water and electricity infrastructure were found on Monday in the Tel Aviv area, with the Israel Police and the Shin Bet (Israel Security Agency) announcing that they would open an investigation.

"Not a single power plant, refinery, or desalination plant will remain in the occupied territories. From south to north, your energy and water arteries will shatter like glass," read part of the message in the leaflets, with the police saying that the circumstances surrounding the distribution of these leaflets are currently under investigation.

According to an initial assessment by the Israel Police, residents of Tel Aviv found the leaflets with a QR code that, when scanned, led to a webpage deemed by the police as "suspected threatening content," with the message being linked to the Handala group.

In an image shared by the police, the hacktivist group threatens to target Israel's water desalination plants and energy sites if Israeli leaders "attack the energy infrastructure of the Resistance Front."

It also warns: "When the shadows of the Resistance decide to act, you will face a world where darkness and thirst will be your only companions, day and night. From now on, you will be forced to spend your lives in the depths of shelters devoid of electricity, water, and hope."

"The sounds of the commotion in your cities will be silenced forever. This is the final warning. The choice is yours – wisdom, or sinking into the darkness and silence of disaster," the message concluded.

The police instructed anyone who finds these leaflets in the street to contact authorities, and said that an investigation was ongoing.

This is a developing story.