The Tenors have incited a social media maelstrom after one member changed the lyrics of ‘O Canada’ at Tuesday night’s MLB All-Star game in San Diego.

A singer in the British Columbia-based vocal group substituted the verse “With glowing hearts we see thee rise, the True North strong and free!” with “We’re all brothers and sisters -- all lives matter to the brave.”

The anthem, which failed to make it on live U.S. television but aired in Canada, seemed to surprise baseball fans at Petco Park. The member, Remigio Pereira, even held up a handwritten double-sided sign that read “All Lives Matter” and “United We Stand” during the short performance.

The Tenors are Pereira, Fraser Walters, Clifton Murray and Victor Micallef. With multiple platinum albums under their belts, the quartet even won ‘Adult Contemporary Album of the Year’ at the 2013 Juno Awards.

On social media, people were quick to decry the tone-deaf political statement.

The All-Star game comes in the wake of a week of racially charged violence in the U.S.

On July 5, a black Louisiana man was filmed being shot at point-blank range by a white police officer. The following day, a black man was shot to death during a traffic stop in Minnesota. Protests erupted across the country, culminating in the shooting deaths of five police officers during a rally in Dallas, Texas.

On Twitter, The Tenors quickly blamed Pereira, describing him as a “lone wolf” who changed the anthem’s lyrics “to serve his own political views.”

“Our sincere apologies and regrets go out to everybody who witnesses this shameful act,” the group wrote.

“The actions of one member of this group were extremely selfish and he will not be performing with The Tenors until further notice.”