Why did two people climb to the top of the Empire State Building?

Two people climbed to the top of New York City's iconic Empire State Building on Wednesday, unfurling a large peace banner before appearing to stage a marriage proposal high above Manhattan.

According to Reuters, the pair reached the landmark skyscraper's antenna spire, approximately 1,454 feet (443 metres) above street level, where they displayed a black banner bearing the message: "When the power of love beats the love of power the world knows peace."

Dressed in sleeveless black outfits, the two individuals remained near the illuminated red beacon at the top of the building while holding the banner as it waved in the wind. Their identities have not been confirmed, and it remains unclear how or when they gained access to the restricted area atop the Empire State Building.

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Video footage later showed the pair descending to a lower platform within the antenna structure. Shortly afterwards, one individual appeared to kneel before the other in what looked to be a marriage proposal. The two then embraced and appeared to kiss, leading observers to speculate that the demonstration was part of an elaborate proposal rather than solely a protest.

The New York Police Department said the situation was still developing but did not provide additional details or confirm whether any arrests had been made. Authorities also have not commented on how the individuals accessed the building's upper structure.

The Empire State Building is one of New York City's most recognisable landmarks and is generally closed to public access above its observation decks, making the incident particularly unusual.

As officials continue to investigate the circumstances surrounding the stunt, images and videos of the banner display and apparent proposal have circulated widely across social media, attracting significant public attention.