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Investigators served search warrants at the homes of the two suspects, where they found improvised explosive devices they believe were made to use in the school attack.

There are pops of surprise, especially as Charlie demonstrates his newfound aptitude for improvised explosive devices, but there’s no mystery.

Two improvised explosive devices were also found nearby, according to police.

The FBI has said the black flag of the Islamic State group was found inside the vehicle which ploughed into partygoers, along with two suspected improvised explosive devices discovered nearby.

The FBI is investigating at least one suspected improvised explosive device found at the scene of what is being called an act of terrorism.