Someone needs to teach Israeli intelligence Tsiolkovsky's rocket equation. It is the FUNDAMENTAL FACT of rocketry. To make a major increase in range one must either drastically decrease airframe weight and increase propellant weight (Mass Fraction), drastically increase the specific impulse (energy in the fuel), or make a great increase in the size of the rocket. The increase in size necessary to reach Tel Aviv would make it extremely difficult to smuggle, construct or use. The improvements in mass fraction or specific impulse are way beyond demonstrated Palestinian technology. Sounds like a scare tactic which is not credible unless the Palestinians DEMONSTRATE the capability with a test.
Jerusalem suburb of Even Sapir evacuated as wildfire spreads (Haaretz)
from the article: Israel intelligence official: Hamas rockets can reach Tel Aviv