Animal rights protesters are blockading four McDonald's distribution centres in the UK in an attempt to get the burger chain to commit to becoming fully plant-based by 2025.
Around 50 protesters from Animal Rebellion were using trucks and bamboo structures to stop trucks from leaving McDonald's four distribution centres in the United Kingdom.
A spokeswoman for McDonald's UK apologised to its customers for the disruption.
"We are assessing the impact on deliveries to our restaurants and to menu items," she said.
The group said it would remain at the sites for at least 24 hours to disrupt the company's supply chain, adding that the move would affect some 1300 restaurants..
"The meat and dairy industry is destroying our planet: causing huge amounts of rainforest deforestation, emitting immense quantities of greenhouse gases and killing billions of animals each year," said James Ozden, a spokesperson for Animal Rebellion.
"The only sustainable and realistic way to feed 10 billion people is with a plant-based food system. Organic, free-range and 'sustainable' animal-based options simply aren't good enough."
Images released by Animal Rebellion showed a replica model of McDonald's golden M-shaped arches logo splattered with blood-like red paint and protesters suspended in the bamboo structures at the gates of a distribution centre.