Detroit police have arrested a fifth person in the beating of a motorist who'd stopped to help a 10-year-old boy struck by his truck.

Chief James Craig says the 19-year-old was arrested Wednesday, but his name hasn't been released. Craig says more arrests are "a strong possibility."

Arraignments were Tuesday for 17-year-old Bruce Wimbush Jr., 30-year-old Wonzey Saffold and 24-year-old James Davis. They're charged with assault with intent to murder and assault with intent to commit great bodily harm.

A 16-year-old boy also faces a hearing Saturday.

The motorist, Steve Utash, remains hospitalized with head injuries. At least six people punched and kicked him April 2, when the 54-year-old tree trimmer stopped to check on David Harris after the boy stepped in front of his truck.

Clergy from various faiths inside and outside Detroit will hold a prayer service for Mr. Utash.

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The "A Night of Healing" program is scheduled for 7 p.m. Thursday at Historic Little Rock Baptist Church in Detroit.

A news release says the family of 54-year-old Steve Utash will attend the program. Mayor Mike Duggan also is expected to attend.