Police on Wednesday afternoon swarmed the Chestnut Street area between North Livermore Avenue and North I Street in response to a report of an armed gang member who threatened a person with a handgun.
Officers were sent to the area at 3:05 p.m. and were unable to locate any evidence that a crime occurred, Sgt. Kevin Santin said.
"The reporting party left, we can't substantiate the call and people in the surrounding area claim to not have seen anything," Santin said. "We got a whole big nothing."
Police were able to make contact with an owner of the cell phone used to make the 911 call.
The owner of the cell phone told police a frantic guy walked up to him and asked to borrow his phone for an emergency, Santin said.
After a call was placed to police the phone was handed back to the owner and the guy took off, according to police.
The caller said a member of the Sureno gang — dressed in all blue with a bandana across his face — threatened him with a gun, Santin said.
Police cleared the area at around 3:20 p.m.