More than 800 serving officials in the US and Europe have signed a statement warning that their own governments’ policies on the Israel-Gaza war could amount to “grave violations of international law”.

The “transatlantic statement”, a copy of which was passed to the BBC, says their administrations risk being complicit in “one of the worst human catastrophes of this century” but that their expert advice has been sidelined.

It is the latest sign of significant levels of dissent within the governments of some of Israel’s key Western allies.

One signatory to the statement, a US government official with more than 25 years’ national security experience, told the BBC of the “continued dismissal” of their concerns.

“The voices of those who understand the region and the dynamics were not listened to,” said the official.