"Resistance will continue until Iran sends its enemies to the morgue," he said on his website, making a reference to the US and Israel who he said are "on the verge of collapse and gasping for their last breathes."
Ahmadinejad may have been reacting to news from Iranian state media that Iran brought down a U.S. "spy drone" flying near its Fordo nuclear enrichment plant in Qom province.
State-run Press TV didn't say when the incident happened. US officials said there were unaware that a US unmanned aircraft was downed, according to news reports.
The Islamic Republic, Ahmadinejad said on his website "is the region's greatest military power."