Over the weekend, the Washington Post reported that a secret Central Intelligence Agency program had helped Colombia kill at least two dozen leftist guerrilla leaders.
And, according to the report, it was thanks to US intelligence that the FARC number two, Raul Reyes, was found and killed in a cross-border attack on Ecuador in 2008 that left 24 dead.
Ecuador temporarily broke diplomatic relations with its Andean neighbour following the incident.
He speculated that the report was an attempt to affect Ecuador's relations with the United States and Colombia and "above all, the peace process" under way between Colombia and the FARC.
Also Read
"At this point, I don't believe in 'coincidences.' Colombia and the international extreme right are capable of anything!" he wrote.
According to the Post, a secret CIA program in Colombia was initially authorised by president George W. Bush around 2000 and has been continued under his successor Barack Obama.
The 2008 incident triggered a diplomatic crisis between Bogota and Quito, with Ecuador suspecting the attack was orchestrated with the help of the United States, despite denial from Colombian authorities.
The governments fully restored relations in 2011.