Iranian officials denied that sabotage was involved and said the explosion was the result of an accident which occurred while ammunition was being moved. A Revolutionary Guard spokesman said an investigation was being carried out into the exact cause of the explosion.
Reports in recent weeks regarding a possible Israeli air strike against Iran's nuclear facilities have raised tensions in the region. Israeli Defence Minister Ehud Barak said yesterday that he did not know the cause of the explosion "but may there be many more".
Two years ago, a similar explosion in a military base 483km from Tehran, where Shahab missiles were stored, killed two people. Foreign press reports at the time said the Mossad was behind that explosion. There have been several other unexplained explosions in recent years.
The spy organisation has also been linked to the assassination of several Iranian nuclear scientists and to the introduction of a computer virus, Stuxnet, which derailed Iran's programme for enriching uranium for a period.
Iranian officials acknowledged on Sunday for the first time that a new computer virus, called Duqu, was targeting the computers of firms in the country. The head of Iranian civil defence, Brigadier General Gholamreza Jalali, said Tehran had developed software to thwart the virus and had distributed it to organisations and corporations.
A western security firm, Symantec, has said Duqu is the precursor to a future Stuxnet-like attack.
Silverstone, the blogger, has become a channel for information that is blocked in Israel by the censor but which certain sources in Israel would like to see published.
He was the first to publish the name of the new head of the Mossad and the first to reveal a secret army memo spelling out the rules relating to the Gaza blockade, including specific foods and other items banned.
But he has not always proven correct. Yossi Melman, who writes on security matters in Ha'aretz, has said Silverstein "has transformed himself into the international message board of information which military censorship and Israeli courts forbid publishing".