The Guardian reported that armed officers discovered the explosives after a member of the public called the emergency number about suspicious vehicles. The materials found in the vans are consistent with improvised explosive devices, according to an initial assessment.
Financial Review reported that US President Donald Trump said the suspects were planning to do "big damage". The base is used by the US military for strikes in Iran.
In a separate development, tensions are running high in Northern Ireland after a contentious march was given the go-ahead, Financial Review reported.