Thousands of people are gathering outside the gates to Downing Street in Whitehall today to demand David Cameron's resignation as Britain's prime minister. The demonstration then plans to march to the Conservative Spring Forum, which is being held in a supposedly secret location in Covent Garden, where Cameron is addressing his party faithful.

The protest has been organised in the wake of this week's revelations in the Panama Papers that the international rich – including the prime minister – have been keeping vast wealth in secretive offshore accounts organised by the Panamanian law firm Mossack Fonseca.

On 7 April, Cameron admitted that he and his wife had owned 5,000 shares in Blairmore Holdings, a company set up by his late father in Panama. Investigations by Channel 4 have uncovered at least three funds linked to the prime minister's father Ian were registered in the small Central American nation.

The protests, which have gained incredible traction on social media over the course of just a few days using the hashtags #ResignCameron and #CloseTaxLoopholes, have won high-profile support from the likes of Edward Snowden and Lily Allen. Many attendees are wearing Hawaiian shirts and are carrying bananas, in a reference to the Panamanian climate.

Abi Wilkinson, a journalist and activist who organised the demonstration, said she was inspired by from recent demonstrations in Iceland. The protests saw more than 10% of the Island's population took to the streets in protest at revelations about Prime Minister Sigmundur Davíð Gunnlaugsson within the Panama Papers. He resigned on 5 April.

Cameron's bad week

Cameron, meanwhile, has admitted at the Conservative Forum that "it has not been a great week" for him – an admission which was reportedly met with laughter from guests. The Conservative Party central attempted to keep the location of the party's gathering secret, by refusing to reveal its location to members of the press who were not in attendance.

Mossack Fonseca director Ramon Fonseca has denied any wrongdoing. He said the firm had suffered a hack on its database and described the leak as "an international campaign against privacy", according to Reuters.

All of those implicated in the International Consortium of Investigative Journalists' Panama Papers report have been afforded the opportunity to respond. Visit the ICJI website to read the responses.