FREMONT -- Three Fremont schools were put on lock-down Wednesday morning after a 15-year-old boy allegedly confronted a man, said he had a gun and threatened to fight him just steps away from a school, Fremont police said.

The incident occurred at 9:20a.m. across the street from Centerville Junior High School, at 37720 Fremont Blvd. After the victim, a college student, left and called police, officers arrived at the school and put it on lock-down. Nearby Washington High School and Holy Spirit High School were also put on lock-down as a precautionary measure.

While schools were on lock-down, officers continued their search for the teen and soon located him nearby. He denied having a gun and no weapon has been located. Police would not say which of the three schools the boy attends.

On Wednesday afternoon, the teen was still in police custody as officers investigated the incident. The lock-downs were lifted at 10:15 a.m.

Contact Karina Ioffee at 650-576-9626. Follow her at Twitter.com/kioffee.