Thousands of demonstrators filled the streets of London on Saturday, delivering a pointed message to the United Kingdom's incoming prime minister: take immediate action on Gaza. The protest, organized by the Palestine Solidarity Campaign, marked the latest surge in public pressure on a Labour government that critics say has failed to match words with deeds over the conflict. Main Developments Protesters directed their demands at Labour leader Andy Burnham, who is set to officially become prime minister on Monday. The crowd called for an immediate arms embargo on Israel and for the new government to pressure Tel Aviv to end its siege and military campaign in Gaza, where more than 73,000 Palestinians have been killed since October 2023. Palestinian ambassador to the UK, Husam Zomlot, led the march through central London, where participants chanted slogans and held placards in support of Palestine. In a post on X, Zomlot declared that the movement for justice and accountability is growing louder and stronger worldwide, despite what he called three years of ongoing genocide. Read also: Why Iran's Bridges and Water Plant Became Targets Background Burnham's Labour Party has faced severe criticism for its handling of the Gaza crisis under outgoing Prime Minister Keir Starmer. Despite mounting evidence that Israel committed war crimes, Starmer's government continued to supply weapons to the country. Critics accused the administration of taking only symbolic measures, such as sanctioning far-right Israeli ministers Itamar Ben-Gvir and Bezalel Smotrich. Former Labour leader Jeremy Corbyn, whom Starmer expelled from the party, also attended Saturday's march. Corbyn called on Burnham to end what he described as Britain's complicity in genocide, vowing in a post on X that the movement would never stop campaigning for Palestinian liberation. Why It Matters The incoming prime minister inherits a deeply fractured political landscape. Beyond the Gaza crisis, Burnham faces a cost-of-living crisis, spiraling student debt, a shortage of affordable housing, and an exodus of party members angry over Labour's lacklustre response to the war. The protest signals that Gaza remains a potent political issue that could define Burnham's early tenure. What's Next Burnham is expected to take office on Monday, at which point activists will watch closely for any policy shifts on arms sales and diplomatic pressure on Israel. The protest organizers have signaled they will continue mobilizing until the government changes course, leaving the new prime minister with an immediate test of his commitment to accountability.