The 29-year-old man, who was armed with a knife, was confronted by two police officers from the Ministry of Defense at around 8.50 am, police said.
An electric shocker was deployed and the man was detained by officers.
The “incident” led to the closure of a busy London street between Trafalgar Square and Parliament Square.
He was arrested on suspicion of attempted murder and possession of an assault weapon.
The man remains in custody at the central police station in London.
There were no reports of injuries. The incident is not treated as terrorism-related. An investigation is underway.
Officers will continue to liaise closely with the Ministry of Defense police as it progresses.
A short video for video surveillance, via Transport for London, shows police vans blocking the street.
Westminster MPS tweeted about the incident shortly after 11:30 p.m.
The Horse Guard Parade is the ceremonial parade in St. James Park.
Anyone who has witnessed the incident, or who has other information that could help employees, is asked to call 101 by providing reference number 1730 / 18APR.
Information can also be provided to Crimestoppers, anonymously, on 0800 555 111.
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