BEIJING, Aug. 16 (Xinhua) -- German automaker BMW will recall 156,922 cars in China over defects in their child seats, China's top quality watchdog said Tuesday.

Starting Sept. 1, the recall will involve more than 134,000 X3 models produced between November 2010 and April 2016 and over 22,000 X4 models produced between March 2014 and April 2016, according to a statement from the General Administration of Quality Supervision, Inspection and Quarantine.

Welding problems were found in the lower anchors of the child seats on those models, which may prevent the seats from being secured properly and raise the possibility of passenger injuries during accidents, the administration said.

BMW China Automotive Trading Co., Ltd. will repair the anchors of the recalled cars for free, according to the statement.