It exploded directly in front of two vehicles clearly marked as belonging to Gaza Civil Defense, an emergency services agency, spraying them with shrapnel and apparently killing and injuring first responders.
Israeli officials said the initial strike, which targeted the Hamas commander Muhammad Deif, hit the compound with at least five precision-guided missiles.
All the videos show a plume of white smoke rising from a street crowded with rescuers, bystanders and people injured in the first strike.
In two of the videos, a loud whooshing sound can be heard before the explosion, indicating an airstrike, rather than an artillery blast or an explosion on the ground, said Wes Bryant, a retired U.S. Air Force master sergeant who was responsible for choosing targets and assessing civilian casualties during the campaign against the Islamic State in Iraq and Syria.
Mr. Bryant and Trevor Ball, a former U.S. Army explosive ordnance disposal technician, said that shrapnel damage seen on one of the Civil Defense vehicles and two cars near the blast was consistent with a Spike or Mikholit missile, two munitions used by the Israeli military.
In the aftermath of the two blasts, videos captured people carrying dozens of dead and injured away from the scene, some of them in bright orange Gaza Civil Defense vests.
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