The child's father and the seminary head have been arrested, a police official said.
Abdul Ghaffar Memon, son of Muhammad Rafiq Memon, was found enchained at the seminary in Tando Muhammad Khan town and rescued by the police yesterday, a senior official said.
"He was apparently kept by force at the Madrassah Qasmiya in Tando Muhammad Khan town," senior police official Nasim Ara Panhwar said.
The child resides in Anwar colony of the town.
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The father claimed that he had sent his child to the seminary "because he was naughty and kept running away", according to Panhwar.
The matter came to light when some employees of a FM radio station located next to the seminary heard the child's cries and alerted the police.
The boy told the police that he was kept enchained at the seminary round the clock for the last 10 days and only allowed to go to the bathroom, the police official said.