The Israeli military has deployed white phosphorus, an incendiary substance that can be extremely harmful, over populated areas in Lebanon in its battle against Hezbollah, according to experts, aid groups and visual evidence collected by The New York Times.

Distinctive smoke trails from this type of munition were seen as recently as May 30 in Nabatieh, a city of roughly 40,000, in social media footage verified by The Times, which was filmed as Israeli forces captured Beaufort Castle, a landmark in the area.