The Israelis need to start at the north end of Gaza and level the entire place. Open the border crossing and force everyone (except the dead) into Egypt. The dead should be buried at sea.
No expert on these, however, my understanding is the Iranians smuggle them in via tunnels into Gaza Strip. Apparently these long missiles can be taken down to 3 parts approx. 8 foot long. Then hidden and assembled when ready to fire.
Just guessing, but if “rumors” are true that IDF is assembling near Gaza? These FAJR-5 may be the reason.