Reports of a man trespassing at the Helix Charter High School in La Mesa prompted a lockdown Monday morning.
A school official saw the man and thought he might have a gun, but police later discovered that the suspect's black gloves were mistaken for a gun.
At about 10 a.m., La Mesa Police and a police helicopter searched for a suspicious man around the 8000 block of Allison Avenue.
Police found the suspect a couple blocks away from Helix Charter High School. He was detained and no weapons were found, according to a LMPD tweet.
Anytime there's a threat of violence near a school campus, police said they have to use all their resources while determining if there's a valid safety concern.
Surrounding schools were placed in a lockdown status as a precautionary measure.
Police requested that parents do not come onto campus.