An ISIS-supporting Uber driver who attacked police with a sword outside Buckingham Palace in London threatened to kill non-Muslims only months after he left jail, a court heard on Monday.

The Islamic State group vowed in an audio message released Monday that the extremists will start a new phase of attacks that will focus on Israel and blasted the U.S. administration’s plan to resolve the decades-old Israeli-Palestinian conflict.

The Islamic State group’s self-styled “caliphate” across parts of Iraq and Syria seemed largely defeated last year, with the loss of its territory, the killing of its founder in a U.S. raid and an unprecedented crackdown on its social media propaganda machine.