[custom_adv] Pale-faced and caked in blood, they've been spotted eating entrails outside Mornington Crescent Tube station and bus stops around the capital, and generally shuffling around looking scary. [custom_adv] But fortunately for civilisation, it's not the beginning of the end. It's actually all for a good cause. Hundreds of 'undead' members of the public are participating in a 'Zombie Walk' as part of World Zombie Day. [custom_adv] Active since 2007, the London branch is fundraising for the charity St Mungo's Broadway, which helps to rebuild lives and prevent homelessness. [custom_adv] Over the years, the capital's zombie group has built up a good relationship with the Metropolitan Police - especially important in light of the recent spate of terrorist attacks in the capital. [custom_adv] The World Zombie Day Facebook posts reads: 'We have built a relationship with the police and the city. This relationship and reputation will provide us with security. 'This is because we're collected, we're cooperative, we're polite, we're fun, and we're the best damnable zombies you could ever hope to encounter. [custom_adv] 'Every year we advise participants not to bring weapons: no fake weapons, no fantasy weapons, and DEFINITELY no real weapons.' [custom_adv] Thousands of people around the world donned zombie costumes Saturday to mark World Zombie Day, a fundraiser to combat hunger that was filled with fake blood and braaaaiiiins. [custom_adv] Founded in 2006 in Pittsburgh, where Dawn of the Dead was filmed, the event now attracts aficianados from around the globe, including London and Paris. They're asked to donate nonperishable food for local food banks before they participate. [custom_adv] Organizers say Pittsburgh’s Zombie Walk has established three world records for numbers of participants through the years, though it's tough to find official numbers. The zombies are discouraged from touching anyone as they shamble around and to avoid smearing fake blood on walls, signs or buildings. [custom_adv] World Zombie Day is an international annual event that grew from Pittsburgh's first ever Zombie Walk at Monroeville Mall in 2006 -- the setting for Dawn of the Dead. Now, more than 50 cities participate in the event. Thousands of people around the world donned zombie costumes Saturday to mark World Zombie Day, a fundraiser to combat hunger that was filled with fake blood and brains. Participants asked to donate non-perishable food for local food banks before the event.