Iran-Israel: The US has joined the war. What happens now?

The BBC's world news correspondent Joe Inwood answers three key questions after the US strikes in Iran.

Watch LiveBritish Broadcasting CorporationHomeNewsSportBusinessInnovationCultureArtsTravelEarthAudioVideoLiveHomeNewsIsrael-Gaza WarWar in UkraineUS & CanadaUKUK PoliticsEnglandN. IrelandN. Ireland PoliticsScotlandScotland PoliticsWalesWales PoliticsAfricaAsiaChinaIndiaAustraliaEuropeLatin AmericaMiddle EastIn PicturesBBC InDepthBBC VerifySportBusinessExecutive LoungeTechnology of BusinessFuture of BusinessInnovationTechnologyScience & HealthArtificial IntelligenceAI v the MindCultureFilm & TVMusicArt & DesignStyleBooksEntertainment NewsArtsArts in MotionTravelDestinationsAfricaAntarcticaAsiaAustralia and PacificCaribbean & BermudaCentral AmericaEuropeMiddle EastNorth AmericaSouth AmericaWorld’s TableCulture & ExperiencesAdventuresThe SpeciaListEarthNatural WondersWeather & ScienceClimate SolutionsSustainable BusinessGreen LivingAudioPodcastsRadioAudio FAQsVideoLiveLive NewsLive SportHomeNewsSportBusinessInnovationCultureArtsTravelEarthAudioVideoLiveWeatherNewslettersWatch LiveWatch: The US has joined the Iran-Israel war. What happens now?President Donald Trump says the US has carried out a "successful" bombing attack on three nuclear sites in Iran and said they have been "obliterated".

Israel says they were in "full co-ordination" with the US in planning the strikes. Iranian officials have confirmed the facilities were struck but denied it had suffered a major blow.

The strikes mark a significant escalation in the ongoing war between Iran and Israel.

So what happens now? Here are the key questions, answered by our world news correspondent Joe Inwood.

Video journalists: Sofia Ferreira Santos and Tom Joyner