An informed source of Iran's embassy in London rejected any petrol bomb attacks on the embassy saying the Monday incident was only made by "some burning pieces of paper", reported ISNA.
"The incident was nothing important, just some papers were set on fire and were thrown into the embassy, it only made some parts of the door black."
Some news agencies exaggerated the issue whereas nothing important has happened, the official said.
Cameras of the embassy have clear footages of the event and the person who did it, police is pursuing the issue, this official said.
Earlier today, reports said that Iran's embassy was attacked on Monday, using a petrol bomb. No one was injured in the incident.