Suicide bombing?

Perhaps, but note it was official television reporting. That suggests it may be more spin than truth. Certainly there is a benefit to the regime in saying the protests are the work of a few radicals. Still, it isn't implausible that a suicide bombing could have occurred.

"... In a separate incident, a state-run television channel reported that a suicide bombing at the shrine of the Islamic Revolution leader Ayatollah Ruhollah Khomeini killed at least two people and wounded eight. The report could be not independently evaluated due to government restrictions on journalists."
James Morton
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