A report suggests she was targeted by radical Muslims, but police thwarted the suspects' plans with months of surveillance and multiple raids.
Officials made the queen and Prime Minister David Cameron aware of the incident, but despite the potential threat, her majesty still plans to make numerous public appearances.
British police say they've disrupted an assassination attempt of Queen Elizabeth II.
On Sunday, she paid tribute during a Remembrance Day ceremony at a monument honoring the country's fallen soldiers and marking the 100th anniversary of the start of WWI.
In August, Britain raised its terror threat to "severe," the second-highest level, due to new intelligence regarding Islamic extremists.
The planned assassination attempt follows arrests of 13 men suspected of various terrorism offenses in recent months.
Scotland Yard is still investigating the most recent threat
