Coronado Police received a report of a suspicious device in the alley between E and F avenues near 5th Street, approximately three blocks northwest of Orange Avenue.
Officials said a resident found a box near her car Thursday morning.
As a precautionary measure, the Sheriff's Bomb and Arson Unit was called to investigate, officials said.
By 9:05 a.m., the City of Coronado confirmed officials had inspected the package and determined it posed no threat. The area was cleared and all nearby roadways were reopened.