What is a 'double tap,' and why has Israel's use of it outraged so many?

Israel bombed Nasser Hospital in Khan Younis, Gaza, and then bombed it again, not the first time it has used an apparent "double tap" strike on Palestinians.

It has become an all-too-familiar scene: first responders, medics and journalists rushing to the site of an Israeli attack. But this time, as they rallied to a shattered stairwell at Nasser Hospital bearing stretchers and cameras, Israel struck again — compounding the scene of carnage and enveloping those trying to aid and document.

Global outcry mounted Tuesday over this “double tap” strike on Gaza’s largest remaining medical center, which was caught on video by the Arabic-language channel Al Ghad TV and others who were recording rescue efforts from the first missile when the second struck.

At least 20 people were killed, including five journalists who had worked for various outlets, including The Associated Press, Reuters and Al Jazeera.

On Tuesday, the Israeli military announced it had concluded an initial investigation of the incident, which Prime Minister Benjamin Netanyahu earlier called a “tragic mishap.”

U.N. Secretary-General António Guterres demanded an independent inquiry into the Israeli strike, while President Donald Trump said he was “not happy about it.”