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CONCORD, N.C. – The tension and frustration of NASCAR's playoffs spilled over into post-race contact on the track, on pit road and in the garage Saturday night at Charlotte Motor Speedway following the Bank of America 500.

Normally mild-mannered Matt Kenseth attacked Brad Keselowski in between Team Penske's transporters, putting Keselowski in a headlock before they were separated.

That confrontation capped a wild and confusing series of events which included contact between Kenseth, Keselowski, Denny Hamlin and Tony Stewart.

Here's what happened:

--On a restart with 63 laps to go, Keselowski and Kenseth had a racing incident while vying for the lead.

Keselowski thought Kenseth was pushing him and didn't leave a lane up high toward the wall for Kenseth, who had decided to try and pass. Kenseth was squeezed into the wall and bounced off it into Keselowski, damaging both cars.

--Later, a caution came out with six laps to