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RICHMOND, Va – A tip helped prevent a mass shooting on the Fourth of July in Richmond, Virginia, police say.

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According to the Associated Press, the Richmond Police Department announced on Wednesday that they had received a tip earlier in the week that led to arrests and seizures of multiple guns on the Fourth of July at the Dogwood Dell event.

Richmond Police Department Chief Gerald M. Smith in a news conference said “one phone call saved numerous lives on the Fourth of July.” Both Smith and Richmond Mayor Levar Stoney in the news conference credited the “hero citizen” and kept stressing that “if you see something, say something.”

According to WTVR, the tip came in on July 1 that involved a man or men who were “threatening to do a mass shooting on or about July 4,” at the Dogwell Dell even in Richmond. This person had overheard a conversation about a mass shooting and decided to pick up the phone to call the police department to alert them about what they had heard. Police began to conduct their investigation and found evidence that corroborated what the caller had told police.

Smith called the person who put the tip in a “hero citizen”.

Julio Alvarado-Dubon, 52, was arrested at his home before the July 4 event and booked on a recommended charge of being a non-U.S. citizen in possession of a firearm. A second person, Rolman Balacarcel, 38, was arrested on Tuesday on the same charges, according to WWBT.

Smith said police didn’t have probable cause but had Balacarcel under surveillance which is why he was arrested later than Alvarado-Dubon.

According to the AP, Richmond police spokesperson Tracy Walker said both Alvarado-Dubon and Balacarcel were from Guatemala and are not in the United States legally. Alvarado-Dubon has an expired visa and his bond was set at $15,000, the AP said. His preliminary hearing is scheduled for August 2.

Two assault rifles, a handgun, and over 200 rounds of ammunition were seized during the investigation, said Smith.

No motive has been released but Smith said both suspects were believed to be roommates.

>> Highland Park parade shooting: Crimo confessed to investigators, considered second attack

The announcement from RPD came two days after a mass shooting happened in Highland Park, Illinois where the suspect got on a rooftop and fired into a crowd. According to the AP, seven people were killed and dozens of others were injured. Robert E. Crimo III, 21, was charged with seven counts of murder Tuesday evening with more charges anticipated. No motive has been identified.