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LUBBOCK, Texas (AP) _ A power failure ended a Britney Spears concert after two songs Friday night.

Spears used pyrotechnic effects and explosions while performing ``Oops...I Did It Again'' and ``(You Drive Me) Crazy.'' Arena power and lighting worked after the failure, but Spears' stage shows require additional power.

A member of Spears' management appeared on stage with the entertainer and told the crowd the concert was canceled because of safety concerns.

``I'm just so sorry,'' Spears told the crowd at a Texas Tech arena, before being met with boos. ``Please don't boo,'' she said, then walked off the stage.

Spears' tour began May 24 in Las Vegas and ends July 22 in Dallas.