Why we've all got to stand #WithSyria

This evening, I'll be standing in Traflgar Square along with thousands of others to mark an anniversary we all hoped wouldn't exist.

On Saturday, it will be three years since the start of peaceful protests in Syria. Protests which were brutally supressed, which has led to a conflict that has displaced 9.3 million people from their homes.

9.3 million men, women and children. That's a full million more than the population of London - all trying to flee from shelling, bombing, snipers. To find safety, food, medical help or just their loved ones.

It's an unimaginable number, which is why Save the Children created this incredible video, to start to give us an inkling of what those 9.3 million people are going through.

The largest humanitarian crisis in the world

Those 9.3 million people are in desperate need of humanitarian assistance. In most cases they've left everything behind to escape the conflict.

But despite this desperate need, Syrian authorities are preventing help get to those that need it. At Amnesty, the only way we've been able to report on the desparate situation is for our researchers to sneak across the border, at huge personal risk.

At least 250,000 people are besieged across Syria in places like Yarmouk, and we've seen reports of the few aid workers and doctors trying to help civilians being aribitrarily arrested.

Stand with Syria. Take action.

If you can't stand with me tonight in Trafalgar Square, you can still stand with the people of Syria, and help avoid a fourth anniversary of the crisis.

• Take action now and ask that world leaders demand humanitarian access
• Share this and ask your friends, family and co-workers to stand with Syria

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Still need convincing? Here's the crisis in numbers.