Colombian police say the country’s main leftist rebel group has freed four Chinese oil workers it kidnapped more than a year ago.

Caqueta state police chief Colonel Carlos Vargas told reporters the four men were released to the International Committee of Red Cross around midnight on Wednesday in a rural area of the southern town of San Vicente del Caguan.

The release comes three days after peace talks began in Cuba between the Revolutionary Armed Forces of Colombia, or Farc, and Colombia’s government.