Las Vegas officials are complaining that tickets given away for a concert featuring the Red Hot Chili Peppers and Weezer are being sold on the Internet.

"You get a couple of bums who take advantage of the situation, and what starts off as a very nice gesture . . . turns into a sleazy methodology of trying to make a buck from it," Las Vegas Mayor Oscar Goodman said.

The July 2 show is a celebration marking the city's 100th anniversary.

About 35,000 free tickets were quickly snapped up when they became available online last week. Minutes later, traders began offering tickets on eBay at prices that ranged from $25 to $70 per ticket.

Clark County and the city of Las Vegas forbid ticket scalping. Goodman said resellers may be prosecuted.