CHARLOTTE, N.C. (AP) The NFL and the Carolina Panthers are investigating how protesters got rappelling gear into the team's stadium Monday night and suspended themselves by cables from the upper deck while holding a protest banner during a nationally televised game against the Indianapolis Colts.

Charlotte Mecklenburg Police arrested four people - the two that rappelled and two others that assisted them - and charged them with second degree trespassing and resisting a public officer.

The protest was against Bank of America, which owns the stadium's naming rights.

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Panthers director of security Lance Emory says the protesters purchased tickets to the game through NFL Ticket Exchange but isn't sure how they got the items got through security.

He says, ''We're always concerned with how somebody can bring in something that can disrupt the game.''

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AP NFL website: www.pro32.ap.org and http://twitter.com/AP-NFL