At least one massive explosion at a military weapons depot near the Iranian capital Tehran on Saturday killed several people and was felt at least 45 km miles away, local media reported

The Revolutionary Guards - Iran's elite military force - said a munitions store at a base in Bidganeh, near the city of Karaj, had exploded, according to a statement carried by the semi-official Fars news agency.

"Around noon today there was an explosion in one of the arsenals belonging to the Revolutionary Guards near Tehran," Fars quoted the statement as saying. Several people had been killed, Fars said, without giving further details.

The blast was so big it was felt in western suburbs of Tehran, 45 km away, witnesses told Reuters. Many assumed there had been a low-level earthquake. Some media reports said the initial blast was followed by a second explosion.