A man with an intellectual disability, who had earlier been sentenced under a blasphemy charge but later acquitted due to his condition, was killed in Tando Adam on Friday, police said.
The 32-year-old, Atta Mohammad Buriro, was shot dead in the Kamal Buriro village near Tando Adam town.
Later in the evening, two attackers surrendered themselves to police and confessed to having killed Atta Mohammad "because he had committed blasphemy".
A police official confirmed the arrest of the two self-proclaimed killers, but told local reporters that they were investigating the murder from different angles.
Sharing details of the incident, the official said that the victim, who had only recently been released from captivity, had been bathing at an irrigation watercourse when two pillion riders shot at him, killing him on the spot.
His body had been handed over to relatives after a postmortem examination.
Talking to media persons, SSP Dr Farrukh Lanjhar said the victim was under the trial of blasphemy charges and was released on a bail in the light of a medical report which declared him intellectual disable.
The slain individual, according to police officials, had been booked under Section 295 C on Nov 28, 2012, on the complaint of a local lawyer, Altaf Hussain Junejo.
Tando Adam SHO Ghazi Rajar said the deceased had been released from Central Jail Hyderabad some 15 days ago.