An explosion at a crowded hospital in Gaza City has killed hundreds of people, according to Palestinian health officials. Israel says the number is much lower. Hamas blames Israel, but Israel says it wasn’t them and points the finger at another group, the Palestinian Islamic Jihad. They also say it wasn’t them. Shayan Sardarizadeh, from the BBC Disinformation team, tells us how he has been investigating what happened at Al-Ahli hospital, and whether we can say who was behind it (03:26). We also answer some of the main questions people have been searching for online, like what are Hamas and Palestinian Islamic Jihad, with Hesham Shawish, who covers the Middle East for BBC Monitoring (07:25). And we hear from two 18 year olds, in Israel and Gaza (11:57).

Email: whatintheworld@bbc.co.uk WhatsApp: +44 0330 12 33 22 6 Presenter: Hannah Gelbart Producers: Maria Clara Montoya and Julia Ross-Roy Editors: Verity Wilde and Simon Peeks