Dallas Police Chief David O. Brown is investigating a gun threat made against presumptive Republican presidential nominee Donald Trump Thursday night right before Trump’s rally at Gilley’s.

A screen capture of a photograph posted to Twitter to the account of “@Alejandro_Bruh” shows a male placing a black handgun into a lime green colored backpack with the message, “#TrumpInDallas, gonna be lit” The account has been made private.

The person who made the screen capture, “@SteampunkMuppet” first tweeted it to the Dallas Police and the FBI but received no response.

A few minutes later she tweeted the screen image to a reporter for the Dallas Morning News, Robert Wilonsky, asking for help getting the attention of the Dallas Police.

@RobertWilonsky Hey Robert, any way to get something like this to DPD besides tweeting at them? pic.twitter.com/VCAmdy6fI0 — Spider Jen (@SteampunkMuppet) June 16, 2016

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“@RobertWilonsky Hey Robert, any way to get something like this to DPD besides tweeting at them?”

Within minutes someone tweeted the screen capture to the Dallas Police and Chief Brown.

https://twitter.com/DannySalazar365/status/743590224157020161

“@DallasPD @DPDChief Just passing this on.”

Chief Brown responded almost immediately.

“@DannySalazar365 @DallasPD @SteampunkMuppet @RobertWilonsky …on it…thanks”

The total elapsed time from when the threat was posted at 6:16 p.m. CDT to when Chief Brown responded at 6:50 was 34 minutes.

As of press time Dallas Police announced only one arrest at the rally, for disorderly conduct.

Rally has ended. One arrest for disorderly conduct. Approx 7 causing conflict in the crowd were extracted for their safety.#ProtectingDallas — Dallas Police Dept (@DallasPD) June 17, 2016

“Rally has ended. One arrest for disorderly conduct. Approx 7 causing conflict in the crowd were extracted for their safety.#ProtectingDallas”

UPDATE: Dallas police spokeswoman Sr. Corporal Debra Webb informed The Gateway Pundit the Secret Service is investigating the threat to Trump:

“Our officers passed the information on to the Secret Service who then took over the investigation.”