Police in Roseville, Michigan say a man suspected of trying to steal a drill from a local Home Depot repeatedly stabbed a store guard with a dirty syringe Monday until a customer with a concealed firearm license intervened and ordered the man to stop, according to an Associated Press report (via Michigan’s FOX 32 News).

26 year old Joshua J. Silva was arrested after the incident Monday, which began in the store parking lot. [Video news report after the jump].

The Detroit Free Press has the details:

Roseville Police Chief James Berlin said that Silva claimed he is addicted to heroin, but it is not believed he was on the drug at the time of the assault.

Berlin said Silva began to fight with store loss prevention officers in the parking lot when they tried to apprehend him for stuffing a $179 battery-powered drill under his coat. Silva pulled a concealed syringe from his jacket and used it as a weapon, swinging it around in a slashing motion, police said.

They said he stabbed one of the officers several times with the contaminated needle. Berlin said the victim had more than five puncture wounds on the top of his hand.

A customer with a concealed pistol license saw the fight, pulled out his handgun and told Silva to drop the syringe and get on the ground. Silva stopped fighting and sat down in the parking lot, police said, but jumped up and ran when he heard approaching police sirens. The loss prevention officers allowed him to run and police officers arrested him without further incident.

The citizen told police he got involved because the suspect was so violent and appeared to “be getting the best of” the loss prevention officers. He said he feared if he didn’t get involved, the suspect was going to kill one of the store officers, police said.

The Detroit Free Press reports that the injured loss prevention officer was treated at a local hospital and did not wish to speak to the media.  The customer who intervened wishes to remain anonymous and also did not want to speak to media.

Silva was arraigned Tuesday on second-degree retail fraud and assault with intent to do great bodily harm, and was held on $25,000 bond.

The Michigan State Police crime lab has received the evidence from the incident and are currently testing the syringe(s) for any signs of communicable disease, according to The Detroit News.

7 Action News / WXYZ Detroit also reports, “Police say they will now put in for an award for that legally armed citizen who stepped in to help.”

Video report from 7 Action news below. Additional video also available at WDIV 4 news.

[Featured image: 7 Action News / WXYZ Detroit video]