A wheelchair-bound amputee attacked a 3-year-old boy in an Albuquerque grocery store on Monday night, fracturing the child’s skull.

Police told ABC News affiliate KOAT-TV that Clayton Senn was seen swinging a hammer at other children in the store as well before finally coming upon his young victim. The boy’s stepfather had to be restrained by witnesses once it became clear what happened.

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The 3-year-old, who was not named, was taken to a nearby hospital bleeding from his head and suffering from a fractured skull. He’s expected to recover.

Police said they have no clue why Senn attacked the children, and a detective told KOAT-TV that the suspect has thus far refused to say anything or even look at officers when they address him.

The same man was the target of a search and rescue mission last year after he went missing outside Albuquerque for three days, according to KRQE-TV. Rescuers found him stuck in the mud of a riverbed suffering from exposure, and his legs eventually had to be amputated due to the damage they sustained.

Senn was also previously charged with aggravated battery with a deadly weapon, and battery of a health care worker.

This video is from ABC News affiliate KOAT-TV, aired Monday, June 17, 2013.