Three people were on a deck when it collapsed Thursday afternoon in Abingdon, near the Bush River, Harford County rescue officials reported.
No one was taken to a hospital, as the three victims refused medical treatment. There was no entrapment, Harford County Volunteer Fire & EMS Association spokesperson Jenn Chenworth said.
The county's Technical Rescue Team was dispatched to the scene.
Members of Abingdon Fire Company remained on the scene with a building inspector, Chenworth said.