DETROIT -

Detroit police say they now have four people in custody for the mob beating of the man that accidentally hit a 10-year-old boy who stepped in front of his truck.

Police announced the two additional arrests Monday.

A 16-year-old and 17-year-old were previously arrested Saturday.

The latest suspects are a 24-year-old and a 30-year-old. No other details were immediately released.

The 17-year-old, Bruce Wimbush Jr., is scheduled to be arraigned Tuesday on charges of assault with intent to commit murder and assault with intent to do great bodily harm.

The 16-year-old hasn't been charged, but was scheduled to appear in juvenile court.

What happened:

Police say a group of at least six people descended on 54-year-old Steve Utash after the accident last Wednesday. Utash, of Macomb County's Clinton Township, was severely beaten and hospitalized.

The boy was treated for a leg injury.

The case has outraged the public, clergy and elected officials. Detroit Mayor Mike Duggan called the attack "senseless."

Prosecutor Kym Worthy said in a statement that the case is "unbelievably tragic," but declined further comment "because this investigation is continuing and widening."

A web page launched to accept donations for Utash's medical bills has raised more than $100,000. He has no medical insurance.