Reports of a blast near Khomeini's shrine

Shades of the “Reichstag Fire”, Berlin ca 1933.

According to the AP, "witnesses say police are using tear and water cannons to disperse thousands of protesters rallying in Tehran to demand a new presidential election."

It's correspondent is raising the possibility that the bombing reported to have happened near the shrine of Ayatollah Khomeini was the work of the government, which might be trying to pin blame on the protesters.