Will McCallum, the environmental campaign group’s UK head, and the others, disguised as delivery riders on bicycles with trailers, Greenpeace said, tipped the dye into the high-security embassy’s semi-circular pond.

McCallum and the others were arrested on suspicion of conspiracy to cause criminal damage, which carries a maximum sentence of 10 years in prison.

The Met Police did not immediately respond to a request for comment.

Areeba Hamid, co-executive director at Greenpeace, said that the dye was biodegradable and designed to wash away naturally.

“We took this action because US weapons continue to fuel an indiscriminate war that’s seen bombs dropped on schools and hospitals, entire neighbourhoods blasted to rubble, and tens of thousands of Palestinian lives obliterated,” she said in a statement.

The Israeli offensive in Gaza was launched after Hamas-led fighters attacked southern Israel on Oct 7 2023, killing some 1,200 people and taking 251 hostage, according to Israeli tallies. Since then, retaliatory attacks by Israel have left over 50,000 Palestinians dead, health authorities in Gaza say.