"We are investigating what appears to be the use of white phosphorus in Gaza, including in a strike near a hotel on the beach in Gaza City," the rights group said in a statement.
It said white phosphorus "burns at extremely high temperatures when exposed to air & can continue to burn inside flesh," "causes horrific pain & life-changing injuries" and "can't be put out with water."
"This is why white phosphorus should never be used in civilian areas. Gaza is one of the most densely populated areas in the world. As we continue to closely investigate these deeply concerning cases," the organization added. "Amnesty urges Israel to respect IHL at all times, civilians must be spared."
The statement came hours after Human Rights Watch (HRW) late Thursday said it verified videos showing multiple airbursts of artillery-fired white phosphorus over Gaza and Lebanon on Oct. 10-11.
"Israel’s use of white phosphorus in military operations in Gaza and Lebanon puts civilians at risk of serious and long-term injuries," the HRW said.