One of Latin America's most famous folk singers, Facundo Cabral, has been murdered in Guatemala.

Officials say gunmen opened fire on the Argentine singer's vehicle Saturday in Guatemala City. At least one other person was wounded in the attack.

The 74-year-old Cabral had been on his way to the airport. A second car carrying one or more of his bodyguards was also struck by bullets.

The motive of the shooting was not clear.

Guatemalan President Alvaro Colom said officials are investigating.

Cabral became famous in the 1970s as a protest singer. He went into exile in Mexico after Argentina came under military rule in 1976.

One of his most well-known songs, “No Soy de Aqui, Ni Soy De Alla” -“I'm Not From Here Nor There” – was covered by many other artists, including Spanish singer Julio Iglesias.