Alaa started out with about twenty cats who were left behind as people ran for their lives, in addition to the strays he'd taken in. A year later there were over a hundred - and Alaa started a sanctuary known as Il Gattaro d'Aleppo.
"Some people just left them with me, knowing that I love cats," he said.
Now Alaa is known as "the cat man of Aleppo."
One little girl, who was in tears when she brought him her kitten just before her family fled, asked him to take pictures of her cat to send to her - so he does.
Alaa told the girl that he'll take care of her cat until she can come back.
"Since everyone left the country, including my own friends, these cats have become my friends here," he said. "I'll stay with them no matter what happens."