'I am gonna shoot up job site': Construction worker charged with terroristic threat

Joe Henry Serna charged with making terroristic threat in San Antonio

SAN ANTONIO – A San Antonio man accused of threatening to shoot up a construction job site was arrested Wednesday by police.

Joe Henry Serna, 29, was taken into custody on suspicion of making a terroristic threat, Bexar County Jail records show.

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Serna was one of the subcontractors hired by Brandt Construction for a $1.6 million project, according to his arrest affidavit.

After Serna was given a safety violation on Sept. 12 for operating a lift he shouldn't have, he sent a text message to his supervisor claiming he saw a worker take drugs on the work site.

Days later, he sent another text message to the supervisor with the first threat, according to the arrest affidavit.

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"Since you don't wanna handle safety at the job site and let ppl do drugs i am gonna shoot up job site," Serna allegedly wrote in a text message. "This ain't no joke either!!!"

The general contractor reported the threat to police and sent other workers home for the day, causing a loss of more than $100,000, according to the affidavit.

The next day, workers were sent home again after Serna sent another threat from a different cell phone number, according to the affidavit.

"Ppl wanna be not drug free I'll show them," Serna sent in a text message. "I am goin gods will and handle ppl like that."

Serna was released from jail with GPS monitoring after posting $50,000 bail, jail records show.