United Nations Secretary-General Antonio Guterres expressed increasing concern over the escalating war of words and deadly border clashes between Israel’s military and Lebanon’s Hezbollah fighters.

UN peacekeepers are working to calm the situation and prevent “miscalculation” after both sides heightened their rhetoric and raised the possibility of full-scale conflict, he said on Friday.

“One rash move – one miscalculation – could trigger a catastrophe that goes far beyond the border and, frankly, beyond imagination,” Guterres told reporters. “Let’s be clear: The people of the region and the people of the world cannot afford Lebanon to become another Gaza.”