After members of the band La Excelencia in Guadalajara, Mexico refused to play more songs after closing time, irate members of the audience killed two members of the band and detonated a grenade inside the bar, Vida Divina, according to Mexican newspaper El Occidental.
A 26-year-old woman attending the concert was also shot and injured.
According to El Occidental, four drunk men aggressively demanded the band play more after their set ended - and they did - for a while. After they stopped around 4 a.m. local time Monday morning, one of the men threw a grenade at the stage, and people ran out of the bar. As they did, two of the band members were shot.
The victims were identified as Jonathan Jimenez, 22, the leader of the band, and Gustavo Alejandro, 35. Others were also injured in the explosion.
The shooters fled, and investigators said there is little information to go on because no one saw the vehicle that they used to leave.
Gun violence has risen in Mexico in recent years. According to the Associated Press, drug cartel turf battles around the country have left more than 30,000 people dead since December 2006.