A Mandurah sports store owner says he is "devastated" after his business was targeted by thieves twice in one week.
Sportspower Mandurah on Gordon Road was ram raided in the early hours of Tuesday, July 2.
The offenders got away with over $50,000 of stock.
"They literally devastated us," Owner Hayden Burbidge said.
"As we got into the count we realised just how much stock had been taken".
At 12.30am on Monday, a group of teenagers smashed their way into the store using a sledgehammer.
They stole thousands of dollars worth of clothes and fled on two motorbikes.
Mr Burbidge said their age is concerning.
"To have a ten or 13-year-old roaming around at midnight with sledgehammers breaking into stores...that's a massive red flag for our society right now and where our town is at," he said.
Mandurah Tackle World was also targeted on Monday morning.
Two masked offenders used a vehicle to force their way into the store.
They then filled up a wheelie bin with tens of thousands of dollars worth of fishing equipment.
Rebel Sport on Pinjarra Road was also broken into.
Mandurah Police are investigating if the incidents are linked.
Motorcycle passenger in critical condition after rider allegedly runs red light in East Rockingham
Two men charged over Australind murder
Last call for donations to support Mandurah's homeless
State Government commits to building $5 million electrical training facility at Rockingham TAFE
McDonald's approved for Dawesville
Wanted man known to frequent Kwinana, Mandurah and Rockingham areas
Mandurah woman completes grueling English Channel swim
Man and child seriously injured in South West crash
Motorists warned to expect delays during Kwinana Freeway upgrades