LONDON (AP) — Tens of thousands of pro-Palestinian demonstrators marched through a rainy London on Saturday to demand Israel stop its bombardment of Gaza, and similar calls were heard in cities around the world as the Israel-Hamas war entered its third week.

On the day a trickle of aid entered Gaza, where more than one million people have left their homes because of the conflict, protesters gathered in at Marble Arch near London’s Hyde Park before marching to the government district, Whitehall.

Police estimated the crowd that wound its way through the city for three hours at “up to 100,000.”

Waving Palestinian flags and chanting “Stop bombing Gaza,” participants called for an end to Israel’s blockade and airstrikes launched in the wake of a brutal incursion into southern Israel by the Hamas militant group that controls Gaza.

Authorities in Gaza say more than 4,300 people have been killed in the territory since the latest war began. More than 1,400 people have been killed in Israel, mostly civilians slain during Hamas’ deadly incursion on October 7.

Israel continued to bombard targets in Gaza on Saturday ahead of an expected ground offensive. A small measure of relief came when 20 trucks carrying humanitarian aid were allowed to enter Gaza across the southern Rafah border crossing with Egypt.

The war has raised tensions around the world, with both Jewish and Muslim communities feeling under threat. The British Transport Police force said it was investigating after footage was posted online that appears to show a London Underground driver leading passengers in a chant of “Free, free Palestine” over the subway intercom.

Police said there had been “pockets of disorder and some instances of hate speech” during protests over the war, but “the majority of the protest activity has been lawful and has taken place without incident.”

Hundreds of pro-Palestinian protesters also gathered in Belfast and in Northern Ireland’s second city, Londonderry, where speakers included lawmaker Colum Eastwood of the Irish nationalist Social Democratic and Labour Party.

“The murder of children is wrong,” he told the crowd, calling for an immediate cease-fire in the conflict. “I don’t know how that is so difficult for some of our world leaders to actually utter. It doesn’t matter whether they are Israeli children or Palestinian children.”

Across the border in the Republic of Ireland, thousands marched through the capital, Dublin, calling for an end to Israel’s bombardment.

In France, pro-Palestinian demonstrators gathered in several cities including Rennes, Montpellier, Dijon and Lyon, where thousands of people could be seen chanting “we all are Palestinians” in the central square.