Police and firefighters responded to an accident on Concord Pike at Florence Avenue shortly after 11:00 a.m.
One adult and one child were seriously injured. A second child was also injured. All three were transported to Christiana Hospital.
All lanes of Concord Pike (Route 202) north are closed. Traffic is backed up a little over a mile from the accident scene to the Fairfax Shopping Center.
Police are investigating.
