CHICAGO (WGN) — At least four people were killed and more than 50 were shot — including seven children — over Labor Day weekend in Chicago.

The shootings happened between 6 p.m. Friday and 3 a.m. Monday.

The youngest victim is 4-year-old Mychal Moultry Jr., who was shot in the head while getting a haircut in a home Friday night. Police said the bullets entered through a window.

He was transported to the hospital in critical condition and put on life support. The boy died Sunday.

A $9,000 reward is now being offered by a trio of community organizations for information leading to an arrest and conviction in the fatal shooting of Mychal.  

On Saturday afternoon, a 11-year-old boy and a 14-year-old girl were shot during a back-to-school event after someone fired into a crowd.

Also on Saturday, a 15-year-old boy was shot in a drive-by shooting in the Englewood neighborhood and a 13-year-old was seriously injured in another shooting in South Chicago.

On Sunday, a 14-year-old boy was injured in a drive-by shooting. About an hour earlier, a 17-year-old was shot inside a vehicle elsewhere in Chicago.

In another shooting, a 22-year-old man was shot in the face while standing in his backyard Sunday night. Police said the victim was outside when he heard a loud noise and felt pain. He was transported to the hospital in serious condition. No one is in custody; detectives are investigating.

A bus driver was also shot and seriously injured in the Saturday night. The suspected shooter was taken into custody shortly after the incident occurred.

Editor’s note: This story has been updated to say Mychal Moultry Jr. was getting a haircut when he was shot, not sleeping, after Chicago police clarified.