The United Nations demanded “accountability and justice” for a double strike on a Gaza hospital that killed health workers and journalists, as Israel released the findings of an initial inquiry into the attack.

Israel’s back-to-back strikes on the Nasser Hospital on Monday killed at least 20 people including health workers, journalists and emergency first responders – and prompted international outrage from press groups, medical organizations and national governments.

The Israel Defense Forces (IDF) said its initial inquiry found that troops from the Golani Brigade operating in Khan Younis had identified a camera “positioned by Hamas in the area of the Nasser Hospital that was being used to observe the activity of IDF troops, in order to direct terrorist activities against them.”

Israel did not offer evidence for its claim, nor did it explain why the first strike was followed by a second minutes later. The location is regularly used by reporters and news outlets for live streaming, and Israel did not explain whether it had attempted to distinguish between journalists’ cameras and one it said was set up by Hamas.

The Israeli military also claimed the strikes had killed six “terrorists,” providing names but no further details.

Hamas denied operating a camera at the hospital. “If this claim were true, there are many means to neutralize this camera without targeting a health care facility with a tank shell,” Bassem Naim, a member of Hamas’ political bureau, told the Associated Press.

Among those killed were five journalists including Mohammad Salama, a cameraman for Al Jazeera, Hussam Al-Masri, who was a contractor for Reuters, Mariam Abu Dagga, who has worked with the Associated Press and other outlets throughout the war, and freelance journalists Moath Abu Taha and Ahmed Abu Aziz.

A hospital spokesperson said four health workers had also been killed, and Gaza’s Civil Defense organization said one of its crew members was killed in the strike.

Global anger over the attack continues to deepen. On Tuesday, the UN Human Rights Office condemned Israel’s military and demanded an independent investigation into the attack.

“The killing of journalists in Gaza should stop, should shock the world. Not into stunned silence, but into action, demanding accountability and justice,” said UN Human Rights spokesperson Thameen Al-Kheetan. At least 247 Palestinian journalists had been killed since October 7, 2023, he added.

In a separate attack Monday, another journalist, Hassan Douhan, was killed by Israeli forces in Khan Younis, according to the Palestinian Journalists Syndicate, who said he “was shot by the occupation forces in his tent.”

Countries including Canada, the UK, Germany, Switzerland, France, Spain, the European Union, Australia, Qatar, Saudi Arabia, and Kuwait also condemned the strikes.

When asked for his reaction, US President Donald Trump said he had not heard about the strike, but that he was “not happy about it.”

US Special Envoy Steve Witkoff later told Fox News that Trump is expected to hold a “large meeting” at the White House Wednesday on the war in Gaza.