WASHINGTON – Britax Child Safety Inc. is recalling 355,516 child seats because a harness can loosen and endanger the child, the government said Wednesday.

Britax is recalling all Marathon, Husky, Wizard and Snug Seat Traveler Plus seats. The seats were made between August 2002 and this July and have the model numbers E9L06, E9L30, E9L07 and E9L32, the National Highway Traffic Safety Administration said.

Britax said no injuries have been reported because of the defect, which was discovered during company testing. Britax found that the adjuster strap could slip within the metal buckle that controls the tightness of the shoulder harness.