Bombs left at a Southern California social services facility by the gun-wielding radical Muslim couple who killed 14 and wounded 21 were set to go off when first responders arrived, Fox News learned on Monday, in a vicious strategy often seen in the Middle East.
None of the pipe bombs left at the Inland Regional Center in San Bernardino by Syed Farook and Tashfeen Malik in Wednesday's attack detonated, but the technique has investigators very concerned, sources told Fox News.
"This was meant to kill more, but also scare other future responders to attacks," a source with inside knowledge of the investigation said. "This was meant to get into the minds of medics and officers who are arriving first on scene."
It remains unclear why the bombs did not detonate. It could have been water from the sprinklers or a malfunction with remote control devices, according to investigators.