A six-year-old boy Alex from New York wrote a letter to President Barack Obama about a little Syrian boy who was photographed last month covered in dust and blood after an airstrike in Aleppo, the epicentre of the Syrian Civil War.

The image of five-year-old Omran sat alone in an ambulance, covered in dust and blood, shocked the world and inspired six-year-old Alex, from Scarsdale, New York, to take action.

He has won the respect of US President Barack Obama and thousands of others after he offered to take in Omran Daqneesh.

Alex's request was simple, he asked Obama if he could "please go get him (Omran) and bring him to our home, where we will be waiting for you guys with flags, flowers, and balloons."

"We'll give him a family and he will be our brother," he pledged. He said he'd introduce Omran to Omar, one of his Syrian friends from school.

We can all play together. We can attend birthday parties, and he (Omran) will teach us another language," he wrote.

Alex also promised that he and his sister Catherine would share their toys with Omran, and that he'd teach his new brother "addition and subtraction."

In his message, Obama asked people to read the letter to "understand why he had decided to share it with the world."

Obama lavished praise on Alex at the Leaders Summit on Refugees in New York. "The humanity that a young child can display, who hasn't learned to be cynical, or suspicious, or fearful of other people because of where they're from, or how they look, or how they pray. We can all learn from Alex," he said.

"We should all be more like Alex. Imagine what the world would look like if we were," he added.

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Nandini