Pope Leo has blasted leaders who spend billions on wars and said the world was “being ravaged by a handful of tyrants”, in unusually forceful remarks in Cameroon after US President Donald Trump attacked him again on social media, Reuters reports.

Leo, the first US pope, also decried leaders who used religious language to justify wars and urged a “decisive change of course” in a meeting in the biggest city in Cameroon’s anglophone regions, where a simmering conflict going back nearly a decade has left thousands dead.

“The masters of war pretend not to know that it takes only a moment to destroy, yet often a lifetime is not enough to rebuild,” the pontiff said.

“They turn a blind eye to the fact that billions of dollars are spent on killing and devastation, yet the resources needed for healing, education and restoration are nowhere to be found.”