 No air raid sirens were activated ahead of the explosion due to a human error. The Houthi militia, backed by Iran, says it used a new drone called Yaffa, which can evade Israeli air defense systems. Gordon. Thank you, Don. Police say the explosion was heard for miles. Meanwhile, Israel is in conflict not just with Hamas and the Houthis, but is also exchanging fire with Hezbollah along its border with Lebanon in a multi-front conflict.