BOGOTA, Colombia (AP) — President Juan Manuel Santos lashed out on Tuesday at opponents he accuses of fueling a wave of booing that has greeted him in the days since a deadly attack by leftist guerrillas dealt a major setback to negotiations with Colombia's biggest rebel movement. [...] Colombians' patience with the FARC has always been tenuous, with many recalling the previous attempt at peace more than a decade ago when the rebels took advantage of a Switzerland-size demilitarized zone ceded by the government to rearm and launch attacks. Anger boiled over last week after a rebel unit killed 11 soldiers in an attack on an army platoon sleeping in a rural hamlet.