Reuters has been unable to verify reports
since Friday of an explosion at the underground Fordow bunker, near the
religious city of Qom, that some Israeli and Western media have said
caused significant damage.
Tehran has accused Israel
and the United States of being behind cyber attacks and the
assassination of its nuclear scientists, aiming to sabotage a nuclear
program which the West suspects hides an attempt to develop nuclear
weapons.
"The false news of an
explosion at Fordow is Western propaganda ahead of nuclear negotiations
to influence their process and outcome," state news agency IRNA quoted
the deputy head of Iran's Atomic Energy Organisation, Saeed Shamseddin
Bar Broudi, as saying late on Sunday.
The
IRNA report also quoted the head of parliament's national security and
foreign affairs committee, Alaeddin Boroujerdi, strongly denying there
had been an explosion.
The plant at
Fordow in late 2011 began producing uranium enriched to 20 percent
fissile purity, compared with the 3.5 percent level needed for nuclear
energy plants, and has been operating 700 centrifuges there since
January this year, according to Western diplomats.
Western
governments are concerned that high-grade enrichment is a significant
step towards developing a nuclear weapons capability.
Iran
maintains its nuclear activities are entirely peaceful and that it
began producing high-enriched uranium that it was no longer able to
obtain from abroad for medical use.
The
two sides are set to resume negotiations in coming weeks but the talks
have been beset by delays and wrangling over dates and location.