A weekend shooting spree spanning at least 12 incidents in Austin, Texas, ended with three teenagers in custody and four people hospitalized, one with critical injuries, according to CBS News.

According to Austin Police Chief Lisa Davis, the chain of events started when a car was taken from an apartment complex and a gun was reported stolen from a nearby store. Davis said that while investigators initially did not connect the two thefts, roughly 20 more calls tied to the suspects soon came in, most of them concentrated in South and East Austin, according to CBS News.

Targets included apartment buildings, private homes, and two fire stations. Austin Mayor Kirk Watson noted that at one of the targeted stations, firefighters were positioned directly behind a truck when it was hit, according to ABC News. When the shootings resumed Sunday morning, one victim was struck from behind while out walking his dog, Davis said. In total, three fire department vehicles, four residences, and five other vehicles were struck by gunfire, and at least five vehicles were stolen, according to CBS News.

Throughout the spree, the teens cycled through multiple stolen vehicles, with investigators noting what appeared to be deliberate car-switching as events unfolded. The gun used throughout the incidents was allegedly taken by the 15-year-old from a store; the 17-year-old, Cristian Fajardo Mondragon, was already wanted on a warrant stemming from a separate theft at that same store, according to CBS News.