LONDON, June 15 -- A royal ceremony in the United Kingdom was briefly overshadowed by protests as demonstrators gathered outside a major annual royal event, voicing anti-monarchy sentiments and calling for political reform.

The incident took place during the traditional Trooping the Colour parade, an event held to mark the official birthday of the monarch. Members of the royal family were in attendance as carriages passed through central London amid heavy public and media presence.

According to reports, protesters associated with the Republic campaign staged demonstrations near the parade route, chanting slogans and holding placards calling for the abolition of the monarchy. The group reiterated its demand for replacing the monarchy wit...