TEHRAN — Iran’s Islamic Revolutionary Guards Corps said Sunday that it had shot down an Israeli drone as it was heading toward the Iranian nuclear enrichment site in Natanz, local news media reported.

“A spy drone of the Zionist regime was intercepted by a surface-to-air missile,” the state Islamic Republic News Agency said, quoting a statement by the public relations department of the Revolutionary Guards. “The vigilant reaction of our defense system downed this drone before it could reach the skies over Natanz.”

No evidence was provided, and Israeli officials declined to comment on the report.

The report followed an announcement by President Hassan Rouhani in which he unveiled Iran’s new, locally produced missiles and drones. In his speech on Sunday, Mr. Rouhani emphasized that the new weaponry was for defensive purposes only.

“Some think we are making these to throw on the enemy’s head,” Mr. Rouhani said, referring to the additions to Iran’s arsenal, in an excerpt from his speech quoted by the state news agency. “No. Of course, if one day it is necessary, we may do it, but the reason for making them is to prevent war.”