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Earlier this month, the Southwest Little League at Tijuana River Valley Regional Park was vandalized. League officials said thieves stole the bleachers at the T-ball field, as well as backrests and benches from two other fields.

The thieves target: aluminum.

League organizer Felix Valdez told 10News, "Just to replace the bleachers alone it's about $7,000 each one, so $14,000 for those two."

At 44 cents per pound, scrap aluminum has a fraction of the value of copper, which has seen a tripling in value in the last couple of years.

In the last year, 10 San Diego city parks suffered more than $160,000 in damage due to copper thefts.

An official with San Diego County told 10News this was the first case of aluminum being stolen to presumably be sold for scrap they have ever seen.

As the theft is under investigation, wooden slats will be used to replace the aluminum.

"We don't have much money, so we used two-by-six [slats] and we're posting that so the kids don't get hurt," said Valdez.

Many who attend Southwest Little League games will now be forced to stand due to the theft.