FARC guerrillas killed two police officers in an attack in southern Colombia, authorities said.
A police commander and a civilian woman also were wounded in the attack yesterday afternoon near the town of Solano in the department of Caqueta, the National Police said in a statement.
The officers were on patrol and meeting residents in Solano when they were attacked with small arms fire by FARC supporters, the statement said.
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Fighting has continued despite the talks, with the government rejecting rebel calls for a ceasefire.
Santos argues that the FARC would use a ceasefire to regroup militarily under the cover of peace talks.
The Revolutionary Armed Forces of Colombia, or FARC, has been waging an insurgency against the state since 1964.
The latest round of talks in Havana are the fourth attempt since the 1980s to end Latin America's longest-running armed conflict. So far, however, the two sides have only been able to agree on the first of five points on the agenda.
The FARC is estimated to have 8,000 fighters, although analysts say the group has been weakened militarily in recent years with the loss of key leaders.
A recent government commission estimated that 220,000 people have lost their lives in the conflict. Other estimates run as high as 600,000 dead.