Updated

A United States border patrol agent opened fire while responding to reports of alleged drug smugglers on Arizona’s southern border late Wednesday night, the U.S. Border Patrol told Fox News.

Agents witnessed the smugglers drop a narcotics load on the Arizona side of the border and flee to Mexico, the agency said. One agent discharged his firearm after he was pelted with stones at the scene after his verbal commands were disregarded, the agency said. One person is believed to have been hit by a bullet.

The scene at Nogales, Ariz., was secured and the Mexican government has been informed about the incident. The FBI is leading the investigation.

In January, a similar shooting occurred in the city when an agent fired upon rock throwers while breaking up a drug smuggling attempt.

Fox News' Adam Housley contributed to this report