She was shocked to find his lifeless body on grass patch
1 Boy falls to death
She left her seven-year-old son alone in their 11th storey Aljunied Crescent flat to take her daughter, nine, for her tuition class nearby.
Mr Jumat Mohd, 55, who lives on the same floor, said the boy's relatives told him the boy was fast asleep at the time. It was around 4pm on Thursday.
The woman, who is originally from China, decided to rush down with her daughter as she thought she would not take long, he said.
When she returned to her Block 103 flat, she found her son missing.
Mr Jumat, who works in the oil and gas industry, told The New Paper: "When she found that her son was not at home, she immediately rushed down to look for him. She kept calling his name."
To her horror, she found her son's lifeless body on the grass patch at the rear of the block.
Mr Jumat said: "Her son must have been shocked to find himself alone at home when he woke up, and tried to climb out of the window to look for his mother.
"With windows so wide and grilles left open, it is easy for a child to fall over," Mr Jumat added, referring to the child's 1.2m-tall frame.
2 Neighbours' shock
A 16-year-old who wanted to be known as Priya was walking home to her Aljunied Crescent flat with her friend when a loud sound startled them.
They turned towards the direction of the sound and saw a body on the grass patch a few metres away from the walkway they were on.
Priya was stunned. Her friend burst into tears.
Said Priya: "I was so scared, I didn't know what to do. This is the first time I have seen such a thing."
The student immediately called her elder sister and parents to tell them what had happened.
She then sent her friend, still in tears, off in a taxi.
"I couldn't sleep that night. The image still appears in my mind every now and then," Priya said.