Children suffering: A true picture of Europe’s migrant crisis

No wonder the children cry.

They’re thousands of miles from home, wandering from country to country, sleeping on the ground. They have no toys. Some lost their shoes.

The danger and futility of the European migrant crisis was once again captured in photos of the youngest travelers.

On Wednesday, a group of migrants massed on the Serbian-Hungarian border, seeking to enter the European Union.

A migrant girl has stinging chemicals washed from her eyes Wednesday in Horgos, Serbia.

Hungary had sealed the final hole in its border with Serbia on Tuesday, shutting off a popular route for tens of thousands of people in Europe’s migrant crisis.

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The move left desperate men, women and children – most fleeing violence in the Middle East – blocked from entering Hungary by a razor-wire fence.

A girl cries after Hungarian police use tear gas and water cannons on migrants at the border.

At Horgos, Serbia, they forced their way through, some adults carrying children in their arms or pulling them by the hand.

Hungarian police drove them back with tear gas, pepper spray and water cannons.

Hungarian government spokesman Zoltan Kovacs told CNN on Wednesday that Hungarian forces had been driven to respond when young men armed with sticks and stones tried to enter. He maintained that “proportionate police force” was used.

But the aftermath was heartbreaking.

Hysterical children wailed in their parents’ embrace. Adults doused children’s eyes with bottled water to wash out the stinging chemicals.

A migrant receives help after Hungarian authorities use tear gas on the Serbian border.

Children barely able to walk wept uncontrollably, with no understanding of why they’re not at home.

The body of a 2-year-old boy who washed ashore in Turkey was identified as Alan Kurdi, seen here, left, with his brother, Galip, who also drowned. The boys and their mother, Rehen, died during a treacherous journey across the Mediterranean Sea in September 2015 to escape war-torn Syria. The boys' aunt, Tima Kurdi, who lives in Canada, posted this image to Facebook.

Authorities stand near Alan's lifeless body on September 2, 2015. This photo went viral around the world, often with a Turkish hashtag that means "Flotsam of Humanity."

An officer in Bodrum, Turkey, carries Alan's body away from the shore on September 2, 2015. The child was one of 12 refugees who drowned during a failed attempt to sail to the Greek island of Kos.

People carry a coffin during the funeral for Alan, Galip and the boys' mother, Rehen, in Kobani, Syria, on Friday, September 4, 2015. Alan's father brought their bodies back from Turkey for burial in the city they had fled.

People stand near the coffins during the burial ceremony in Kobani on September 4, 2015.

Abdullah Kurdi, the boys' father and widower of Rehen, mourns during the funeral in Kobani on September 4, 2015.

Men dig graves for the three coffins in Kobani on September 4, 2015.

Kurdi holds Alan's body before burying him in Kobani on September 4, 2015.

One of the coffins gets lowered into the ground September 4, 2015, in Kobani.

Young refugee's body washes ashore in Turkey

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These pictures recalled those of Aylan Kurdi, 2, lying dead on a Turkish beach after a raft carrying his family capsized.

The photo of the boy’s body as an official approached was shared widely on social media, often with the Twitter hashtag #KıyıyaVuranİnsanlık or “Flotsam of Humanity” in Turkish.

More wrenching photos of children are likely.

The impasse at that entry point in Horgos on the Serbian-Hungary border won’t stop the flow of migrant families attempting their arduous journeys, said Eugenio Ambrosi, regional director of the International Organization for Migration.

“People will continue to try to reach Europe through Hungary, Croatia or any other route that might be available to them,” Ambrosi told CNN.

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CNN’s Gul Tuysuz and Ben Wedeman reported from the Hungarian-Serbian border. CNN’s Ralph Ellis wrote in Atlanta.