North Haven Middle School and North Haven High School were locked down Friday morning because of an attempted larceny in the area.
Police said the larceny was not connected to the schools.
The high school is located at 221 Elm Street and the middle school is located at 55 Bailey Road, but they are on the same campus.
The lockdowns were lifted just before 10 a.m.
Police did not say if they had captured anyone in connection with the larceny.