A spokeswoman for the State Department said Friday afternoon that she was not aware of reports that U.S. border agents were fired upon by a Mexican military helicopter that briefly crossed into Arizona.

A CBS affiliate in Las Vegas reported early Friday morning that the shooting happened sometime between midnight and 6 a.m. Friday morning. The affiliate quoted a spokesman for U.S. Customs and Border Protection that said two shots were fired, but that “no injuries or damage to U.S. property were reported.”

A State Department spokeswoman said Friday she was unaware that border patrol agents were fired upon by Mexican officials early Friday morning. (AP Photo/U.S. Customs and Border Patrol)

KVOA-TV reported that Mexican officials were conducting a drug interdiction operation at the time they crossed into the United States.

But in a Friday afternoon briefing, State Department Spokesman Marie Harf said she was not aware of the incident.

“Are you aware of a shooting incident with Mexican law enforcement authorities shooting into Arizona?” AP reporter Matthew Lee asked.

“I am not,” Harf replied.