(CNN) -- Colombia's president renewed calls for rebels to release a French journalist "as soon as possible" Monday as online statements purportedly from leftist guerrillas provided details about his capture. "I am very pleased to know that the French journalist is in good condition. Now that the (Revolutionary Armed Forces of Colombia) have acknowledged that they have him, I call for them to release him as soon as possible," President Juan Manuel Santos said. He said Colombian officials will do whatever they can to guarantee journalist Romeo Langlois' release by the rebel group, commonly known as the FARC. "The Colombian government is willing to provide all the facilities so the release occurs as quickly as possible, but if you really want to be viewed well by the world, release him now and simply tell us where he is and we will go get him," Santos said during a state visit to Singapore.
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Officials say Romeo Langlois has been missing since an April 28 rebel attack
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Colombia's president calls on rebels to free the reporter "and simply tell us where he is"
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Several statements surface online discussing his capture, purportedly from the rebels
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Reporters Without Borders says it is "cautiously confident that he will be freed very soon"
One statement, dated May 3 and published Sunday on a blog connected with a news agency that often publishes official statements from the FARC, criticized @placeholder for wearing a military uniform and claimed that any journalists embedded with Colombian troops have been painting a biased picture.