Colombia has apologized to Ecuador for its warplanes' violating Ecuador's airspace Saturday.
President Alvaro Uribe sent a letter to officials in Ecuador Thursday, saying the intrusion had been an accident.
An Ecuadorian government spokesman said the incident prompted Quito to put its own war planes on a alert. The government had also threatened to withdraw its ambassador to Colombia.
Ecuador said the Colombian war planes also fired on targets in Ecuadorian territory.
Ecuador has long expressed concern that violence from Colombia's four-decade war against leftist rebels could spill across their lengthy border. The government has said its policy is to avoid involvement in Colombia's civil conflict.