By Jeremy McDermott
BBC News, Medellin
Security around Colombian President Alvaro Uribe has been tightened after rebels issued an order for his assassination.
Rebels have been ordered to focus on killing President Uribe
Intelligence services have intercepted guerrilla communications calling all units to focus on murdering Mr Uribe.
Rebel group Farc has intensified its efforts to kill Mr Uribe, who is seeking to change the constitution so he can be re-elected.
Mr Uribe has led a US-backed campaign to crack down on the country's militia.
Threat taken seriously
Farc's orders show a new urgency brought on by Mr Uribe's efforts to stand for a second four-year term in 2006.
The president, who has survived more than 10 attempts on his life, has pledged to bring the guerrilla groups to the peace table at gun-point or defeat them altogether.
Farc leaders have instructed all fronts or guerrilla companies to explore ways to murder the president.
They do not want another administration supported by the US committed to launching all-out military offensives against them.
Security forces are taking the new threat seriously and are reinforcing the president's protection.
Mr Uribe is already the most highly protected Latin American leader and his bodyguards have been sent to the US for training.