A New Jersey mail carrier is facing charges after he allegedly assaulted a fellow mail carrier while on his delivery route.

Police say that the incident happened on Califon Drive in the Colonia section of Woodbridge around 11:30 a.m. Monday. Steven Kromphold, 37, is the usual mail carrier for this area of town.

Police say that another mail carrier was working with Kromphold when they noticed that some of the mail was wrongfully sorted. This led to some sort of argument, and police say Kromphold then punched his 44-year-old assistant in the head.

According to police dispatch calls, Kromphold may have also hit the victim with a mail scanning device.

Police say they found Kromphold at the post office a short time later. He was arrested and charged with aggravated assault.

Police declined to identify the name of the victim. He was taken to Rahway Hospital to be treated for a head injury, but is expected to be OK.