In the early hours of March 13, 2022, streaks of light punctuated the sky above the northern Iraqi city of Erbil as a barrage of rockets rained down on a building near the old town. The thud and blasts shook the city, orange flames rose up and thick black smoke stood out against the deep purple of the night.   This week on Beyond the Headlines, host James Haines-Young looks at why Iran is raining rockets down on neighbouring Iraq.