The lockdown at the school, located at 612 Del Mar Ave., started around 10 a.m. and ended before 11 a.m., Hodge said.
Eleven children in grades K-4 and three adults were in a room at the child care center when the incident occurred, Hodge said. The elementary school itself is closed this week for Thanksgiving.
Hodge said police arrested two male teens in a bathroom on campus and a third teen in a garage at a home across the street.
Hodge said he believes the suspects are juveniles.