The incident happened in the area of 3200 West and 3100 South, and the stabbing victim and suspects all knew each other, Stokes said, adding that the victim and his friends were wearing red, while the suspects were wearing blue, indicating a possible gang-related clash.
Stokes said the victim had no documented gang ties.
At about 3 p.m. Thursday, a group of younger teens walking home from junior high were chased by some 17-year-olds in a black car. The older teens caught the 13-year-old boy, stabbed him once in the shoulder and neck area, and used a blunt instrument likely a baton or pipe to beat him up, according to police.
Two other crimes occurred within blocks of the stabbing.
One incident involved a teenager related to one of the teens involved in the stabbing, who approached family members of the wounded 13-year-old and intimidated them, police said. Initial reports indicating the teen had a gun were unfounded, Stokes said, adding that the teen was questioned by police and released.
The other incident involved an 18-year-old who tried to steal a purse from a woman. When the woman tried to call 911, Stokes said, the man took the woman's phone and broke it.
Police were following leads that the 18-year-old has ties to suspects in the stabbing, Stokes said. He was arrested and booked into the Salt Lake County Jail on suspicion of robbery, assault on a police officer, resisting arrest, consumption of alcohol by a minor and criminal mischief.