A 17-year-old Mandurah boy has been charged after allegedly assaulting a pregnant mother-of-three in the Mandurah Forum on Monday.
A WA Police spokesman said the incident happened about 2.15pm.
He said a 15-year-old girl was also charged after allegedly assaulting a separate female.
A 17-year-old Mandurah boy has been charged after allegedly assaulting a pregnant mother-of-three in the Mandurah Forum on Monday.
They are both due to appear in the Mandurah Children's Court on January 13.
A witness told the Mandurah Mail security guards and police arrived shortly after the fight started.
She said groups of people were watching and clapping during the argument.
It comes after six people were charged following a brawl during an under-13 girls basketball game at the Mandurah Aquatic and Recreation Centre on November 5.
Four of those charged were juveniles. Police said 15 vehicles had attended the incident at 6.40pm, involving about 60 people.
If you have information that could help police, contact Crime Stoppers on 1800 333 000.