I see some confusion in the comments, so I would like to add that these are flak rounds being fired into the sky. It's easy to tell by watching the straight line trajectory of the rounds going up... and of course the random pattern of their explosions. One is able to easily determine the altitude and approximate trajectory of marginally supersonic rocket salvos and approximate location with radar (or even more easily than that, if **they're** the ones **sending** the rocket salvos, themselves...), and then train their flak cannons on that area. Flak rounds are configured to explode at the expected altitude of an incoming threat, indiscriminately dispersing shrapnel, in an attempt to disrupt or destroy said threat. This isn't actually the iron dome, in this video, as many are reporting, insofar as "Iron Dome" is not a general term to describe Israel's layered air defense strategy. The "Iron Dome" is a rocket-based system, looks very different than this, and is not concentrated. Also, the rockets are launched from ground-based tubes primarily located far outside of the city. Flak is typically a penultimate layer of air defense, close in weapons systems or similar strategies (like the Phalanx) being the ultimate.