Courtesy: MyFOX Detroit

A young boy's birthday party turns ugly at a Chuck E. Cheese's restaurant when a grandmother's request sparks a violent reaction from another customer.

FOX News Radio's Jennifer Keiper has more:

A family celebrates a 7-year-old's birthday at the Chuck E. Cheese in Dearborn, Michigan. 

When some people get a little loud - the birthday boy's grandmother asks them to please watch the language. The woman's daughter says that's when a man punches her 50-year-old mother in the face and drags her by her hair.

(Daughter) "It was very scary. All I could do was try to dig through people and look for children."

Another witness says, about the children...

(Witness) "They were pretty scared. Crying. It was scary for them and it ruined a kid's birthday party too."

No arrests. Police say they're investigating.

Jennifer Keiper, FOX News Radio