A fight at a school bus stop involving a gun caused three schools to “Shelter in Place” on Wednesday, according to police who arrested a man accused of assaulting another man.

Police told three Marshfield schools to “Shelter in Place” as they responded to the morning altercation at a school bus stop on Plain Street — about a half mile from the high school, middle school and elementary school complex.

One of the men involved in the fight, 29-year-old Oscar Anderson, is accused of pulling out a gun and assaulting the other man.

Anderson allegedly bit the other man under the armpit and struck his head with a set of keys, police said. The victim was transported to the hospital.

“Marshfield Police have enlisted the assistance of the Massachusetts State Police, Plymouth County Sheriffs Department and our METRO-LEC team to assist us in searching for the gun allegedly shown during the altercation,” police said in a statement. “Dogs specifically trained to detect firearms have been utilized and grid searches of the area and complex are ongoing.”

Anderson was arrested and charged with assault and battery, assault and battery with a dangerous weapon, disorderly conduct, and disturbing the peace. More charged could be coming, police said. Anderson does not have a license to carry.

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The Marshfield superintendent reached out to the school community following the “Shelter in Place.”

“Out of an abundance of caution, they (police) asked those three schools to go into a Shelter In Place,” Superintendent Jeffrey Granatino wrote in a letter. “Students and staff remained in the Shelter In Place for approximately 25 minutes and then they resumed the regular school schedule when advised by police the situation was under control and there was no longer any threat.”

Students and staff remain in their rooms during a “Shelter in Place,” but teaching and learning is able to take place.

“We thank our students, staff and families for their patience and cooperation,” the superintendent added. “We also want to thank the MPD for doing a tremendous job during a challenging time.”