(CNN) A 93-year-old man upset about flooding and water damage in his Las Vegas apartment shot an employee at the residential complex, authorities said.

Robert Thomas has been charged with attempted murder, kidnapping, discharging a firearm within a structure, burglary with a firearm and carrying a concealed weapon without a permit, according to records from the Clark County Detention Center.

A defense attorney for Thomas said in court on Friday that the incident was likely due to mental issues given his age, according to CNN affiliate KVVU

Las Vegas police received a call on January 2, 2020, from a woman at the front desk of the Vista Del Valle Apartments saying that an elderly man, later identified as Thomas, had a gun and was making threats inside the office, Assistant Sheriff Brett Zimmerman said at a news conference on Monday.

"It was later determined that Thomas was upset at the management because of water damage and flooding within his apartment," Zimmerman said. "While on the phone with the caller, the dispatcher was able to hear some of the threats being made by Thomas."

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