Great Britain's Jade Jones made a successful start to the defence of her Olympic taekwondo title with victory in her first bout.

The Welsh fighter beat Naima Bakkal of Morocco 12-4 in last 16 of the -57kg category.

Jones won gold at London 2012 to claim Great Britain's first Olympic gold medal in the sport.

She will face Raheleh Asemani of Belgium in the quarter-finals at 19:30 BST on Thursday.