Israel has killed 20 people, including journalists and health workers, in a strike on Nasser Hospital in the southern Gaza Strip.

In fact, it was two strikes that hit the hospital in Khan Younis on Monday 10 minutes apart about 10am (07:00 GMT).

Israeli Prime Minister Benjamin Netanyahu said in a statement released in English only that Israel deeply regretted what he characterised as a “tragic mishap” without explaining how Israel had hit the same hospital not once but twice in apparent error.

So what is a double-tap strike? Is it legal? Here’s what we know:

What happened at Nasser Hospital?

The first strike hit the top storey of the hospital where Reuters cameraman Hussam al-Masri was operating the news agency’s live feed.

The second strike was filmed live as it killed rescue work

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