estallaron

third-person plural preterite indicative of estallar

Nşh

(intransitive) to explode, to blow up, to burst
(intransitive) to crack (a whip)
(figuratively,intransitive) to break out, erupt (said of a revolution, a war, a fire, etc.)
(intransitive) to break loose
(intransitive) to blow up, to blow one's top, to explode
(transitive) to pop (e.g., a bubble, a balloon, a button, a question)
(transitive) to blow up, to set off, to make explode (hacer + estallar)