Some 1 lack 50 thousand people participated in the march in The Hague, according to organisers.

In Brussels, where protesters were also calling for action from the EU, turnout was estimated at 1 lack 10 thousand.

Rights groups such as Amnesty International and Oxfam organised the demonstrations, which were aimed at creating a so-called "red line" on the issue.

With many waving Palestinian flags and some chanting "Stop the Genocide", the demonstrators in the Dutch city turned a central park into a sea of red on a sunny afternoon before a march towards the International Court of Justice.