The unknown man who had handcuffed himself to the gates of Buckingham Palace was taken into custody, according to the local media.
The news of the incident was shared on Twitter by The City of Westminster Police.
“At around 17:23hrs [5:23 p.m. local time] a man approached the gates of #BuckinghamPalace & handcuffed himself to them. Officers in the area immediately approached the man, believed aged in his 30s, who began threatening to harm himself,” said the statement.
"LAS [London Ambulance Service] are also on scene. Police are trying to speak to the man & bring the situation to a swift conclusion to ensure his safety and welfare," officials continued.
Police said the man, believed to be in his 30s, approached the gates at around 5.23pm on Thursday.
A Metropolitan Police spokesperson said he had sustained "a number of self-inflicted slash injuries".
Officers spoke to him to "bring the situation to a swift conclusion to ensure his safety and welfare".
The London Ambulance Service was also called to the scene.
Police said on Friday the man was taken to a south London hospital to be assessed before being taken into custody.
‘Sonic the Hedgehog 3’ conquers box office in its opening week over Disney’s ‘Mufasa: The Lion King’
Blake Lively makes shocking claims about 'It Ends With Us' co-star Justin Baldoni
Blake Lively’s brother-in-law Bart Johnson speaks out in support of actress
Blake Lively accuses Justin Baldoni of sexual harassment in a bombshell lawsuit
Prince Andrew breaks cover as investigation over ‘spy scandal’ continues to 'stress out' duke
Meghan Markle suffers fresh blow as Princess Kate teaches Duchess a 'vital lesson'