The Colombian government says it has killed the top FARC rebel leader Alfonso Cano in combat.
The government, backed by the US, has been fighting the leftist Revolutionary Armed Forces of Colombia since 2002.
Several FARC commanders have been killed in recent years, boosting the government in its military campaign.
Colombian President Juan Manuel Santos said: “Violence is not the path and I want to send a message to each and every one of the members of this organisation: demobilise, because, on the contrary, as we’ve said so many times, and as we’ve proven, you will end up in jail or in a grave.”
The killing of Cano shows how the army can strike at the group, even deep in the jungles or mountains where they have their bases.
Once a powerful force controlling large areas of Colombia, it is thought the organisation is at its weakest in decades.
Bombings and kidnappings have been significantly reduced.