Harish Kumar was being questioned by his employer, a doctor named Minhal, and his wife who accused the boy of stealing money. He jumped off the building yesterday to save himself, police officials said.
"Minhal is in police custody but claims the boy slipped and fell from the first floor," police officer Imran Shaukat said.
Kumar, from Mirpurkhas in Sindh province, was brought to Karachi by Minhal to work for a nominal salary. The boy, being treated at Jinnah hospital, said he did not steal any money.
In Lahore, 14-year-old Fiza Batool died yesterday after allegedly being assaulted by her employer Salman Rashid, a professor of English Literature at Islamia College.
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The girl had been working at Rashid's home for the past few years. The professor claimed the maid used to steal money.
According to police, Rashid confessed that he hit the girl with a blunt object. The assault damaged her kidneys and lungs.
She was brought unconscious to hospital by the professor on Saturday and later succumbed to her injuries.
A medical board's initial findings showed 13 internal and external injuries on the girl's body.
The girl was apparently abandoned by her parents who have separated.
This was the third such incident in Lahore this month. Earlier, two teenage girls were killed by their employers, and one was sexually assaulted.
Zia Awan, a rights lawyer representing the injured Hindu boy in Karachi, said his employer had committed a crime by keeping him in detention.
Farzana Bari, a well-known rights activist, said employers tend to be violent with their teenage servants, most of whom come from villages to help their families overcome poverty.