“We have increased the reward to R100,000, from R50,000,” Colonel Noxolo Kweza said.
Taegrin Morris died while being dragged for a long distance next to his parents’ hijacked car in Reiger Park, on the East Rand, on Saturday night.
“We are confident that we will be making an arrest pretty soon,” Kweza said.
She appealed to the public not to take the law into their own hands and co-operate with police in their investigation.
Kweza declined to comment on reports that one of the alleged hijackers was pointed out in an identity parade. On Tuesday she denied a report that a man linked to the hijacking had handed himself over. She said a man questioned about the crime was not arrested.
Four-year-old Taegrin Morris was travelling in a VW Golf with his mother, father, and sister in Reiger Park when three men approached them.
READ MORE: Family identifies Reiger Park hijacker
“They ordered him [the father], his wife and daughter to get out of the vehicle,” Lt-Col Khensane Magoai said at the weekend.
“The four-year-old was left in his safety belt. They [the hijackers] got in the car and drove away.”
Magoai said it was unclear how it happened but the boy was then dragged along, hanging outside the car door from his seat belt.
“He was dragged along until Boksburg. The hijackers then abandoned the vehicle and the boy was dead.”