JERUSALEM: Israel inflicted “massive and unprecedented harm” to Palestinian civilians in the 2014 Gaza war with indiscriminate fire and lax rules of engagement, a report said on Monday, citing testimony given anonymously by dozens of troops.

The 237-page report by the Israeli advocacy group Breaking the Silence described how Israel Defense Forces (IDF) left swathes of devastation after they invaded Gaza last July with the stated aim of halting Hamas rocket fire out of the enclave.

“We were firing purposelessly all day long. Hamas was nowhere to be seen,” one tank sergeant was quoted as saying.

The group said its finding cast “grave doubt on the IDF’s ethics.”

Some 2,256 Palestinians were killed during the July-August conflict, of whom 1,563 were civilians, according to UN figures. On the Israeli side, 66 soldiers and five civilians died. The lopsided tolls have fueled foreign criticism of Israel and Palestinian calls for war-crimes suits.

Monday’s report suggested the IDF looked to minimize the risk to their own troops even if that meant harming civilians. An infantry sergeant is quoted as saying that, once Israel deemed civilians had mostly fled an area of operations, “there weren’t really any rules of engagement.”

“The idea was, if you spot something, shoot,” he said. “If you shoot someone in Gaza it’s cool, no big deal.”

Israel questioned the methodology and motivations behind the report. “Unfortunately, as in the past, Breaking the Silence has refused to provide the IDF with any proof of their claims,” a military spokeswoman said.

“This pattern ... indicates that contrary to their claims this organization does not act with the intention of correcting any wrongdoings they allegedly uncovered.”

Breaking the Silence, which listed the Swiss foreign ministry and the Norwegian embassy among its Western donors, said it collected testimony from more than 60 war veterans and called for an external probe “that can examine conduct at the highest ranks in the security and political establishments.”