A deadly blast at the crowded Al-Ahli hospital in Gaza City is feared to have killed hundreds of people.
The Hamas-controlled Palestinian authorities in Gaza immediately blamed Israel, claiming it was a deliberate air strike. Israel has denied involvement.
Amid the claim and counter-claim, getting to the truth is harder than ever.
BBC Verify is trying to unravel what is and isn’t known – looking at video footage, still imagery and other evidence, including eyewitness accounts. In addition, a BBC journalist has been to the blast site, where there is limited access.
New information is emerging all the time, so we will continue to update this article as we learn more and talk to experts about the evidence.
It is also important to note that as well as the physical fighting, this conflict is playing out as an information war. This is not the first time authorities in Israel and Gaza have given completely different accounts of an explosion. We are also looking at their various claims and statements.
The blast
The explosion at the hospital happened at around 19:00 local time on Tuesday. A 20-second video which circulated on social media purporting to show the blast was the first significant piece of visual evidence to emerge of the incident.
In it, you can hear the whistling sound of an incoming projectile, followed by an explosion and a huge fire.
Live footage from the Al-Jazeera media network aired at 18:59 local time showed a bright light rising in the skies above Gaza. Some commentators have suggested it is from a rocket which appears to explode or disintegrate. From the footage, a flash is seen far away, followed by a much larger explosion closer to the camera that we’ve geolocated.
Other footage which surfaced on social media channels showed what appears to be the same blast from different angles and distances.
Source: bbc.com
