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After turning in her son to police, the mother of alleged carjacker Jonathan Rosa, 19,  turned down a reward offered to anyone who could provide information leading to an arrest in a heinous series of crimes that left 3 children dead, reports NBCPhiladelphia.com.

Read more below:

Warren says homicide detectives interviewed Rosa on Saturday after tracking him through his cell phone. The phone was left at the scene of the crash at Germantown and Allegheny Avenues and found by a witness.

The police questioning came a day after he and 23-year-old Cornelius Crawford allegedly carjacked a realtor, sexually assaulted the woman and then sped off with her inside, authorities say. The men lost control of the SUV at the intersection and plowed through a family selling fruit on the corner, police said. The crash killed three siblings, critically injured their mother and a family friend. The realtor was also hurt after the vehicle slammed into a tree.

However, detectives released Rosa after their initial questioning because he said his phone had been stolen, according to Warren. Police had no reason to hold the teen, who did not have a record, the attorney added.

But after the teen returned home and spoke with his mother, she took him back to police on Sunday to turn himself in. Hours later, Crawford was arrested. By Monday, both men were charged.

“His mom had heard that he had been picked up for questioning and she sat down there and she started talking and by Sunday morning they had the pictures of the three kids in the papers. He saw that, lost it and decided to do the right thing,” Warren said.

As previously reported by NewsOne, the children’s 34-year-old mother, Keisha Williams, was listed in critical condition at Temple University Hospital. Her slain children were identified as 15-year-old Keiearra Williams, 10-year-old Thomas Reed and 7-year-old Terrence Moore.

The children’s 34-year-old mother, Keisha Williams, remained in critical condition at Temple University Hospital. Her slain children were identified as 15-year-old Keiearra Williams, 10-year-old Thomas Reed and 7-year-old Terrence Moore.

A 65-year-old woman helping the family with the fruit stand was also hospitalized.

Rosa, who, along with Crawford, was denied bail, is now under suicide watch.