The mothers of the children killed by an unoccupied van, left in reverse while the driver was making a delivery, spoke to the Daily News, and it's just a heartbreaking interview. Wana Wu, whose 3-year-old son Diego Martinez, said the day care program didn't call her about the accident, "My son died by himself in an emergency room. [I was] not able to see my son take his last breath, not to know that he was in pain, not to be by my side - that's the worst thing that can happen to a parent. All I want is justice." And May Ng, whose 4-year-old daughter Hayley died immediately on the sidewalk, "Our children were killed and the driver walks away without even a ticket. How can this be? How can this be allowed?" Their children were good friends; Wu said, "Diego was holding Hayley's hand when they were hit." Lawmakers and community members have demanded the city re-examine traffic in Chinatown.