'All Lives Matter' Message Slipped Into All-Star Game Anthem at Petco Park

The Tenors blame actions of lone-wolf member for change to "O Canada."

Remigio Pereira, a member of the British Columbian group the Tenors, pulled out the sign while singing "O Canada" — to the confusion of the other members of the group.

Pereira unexpectedly sang, "We're all brothers and sisters. All lives matter to the great." The anthem's lyric is "With glowing hearts we see thee rise. The True North strong and free."

"United we stand" was written on the back of his sign.

Some spectators were surprised and upset by what they witnessed:

The group apologized on Twitter, saying that Pereira acted alone during the performance and that he wouldn't be performing with the group until further notice.

The Associated Press contributed to this report.