New York State Police are investigating a gang assault that seriously injured one Hudson Valley high school student. The altercation involved students and football players from three local high schools

An initial investigation by New York State Police at Cortlandt, Bureau of Criminal Investigation, revealed that students from Putnam Valley, Mahopac, and Hendrick Hudson met around 10 p.m. Saturday for a planned brawl. This planned fight involved students and varsity football players from all three rival schools.

Police say during the physical confrontation at least one bystander, who was not directly involved in the original altercation, was beaten by a group of students. The apparent innocent bystander suffered serious physical injuries.

The victim was transported to the Trauma Center at Westchester Medical Center in Valhalla. The victim is listed in serious condition. However, the injuries are not believed to be life threatening. Police also allege that the victim was robbed of his belongings during the assault.

Police have not yet revealed where the planned gang fight took place.

Any witnesses who were not already interviewed by Troopers at the scene of the incident are asked to contact the State Police BCI at (914) 737-7171.