Two men set themselves alight outside the French Embassy here on Friday in fierce protest against the recent French raid against Iranian dissidents.
The two men, who set themselves on fire in separate accidents, had been sent to hospital with one described as in "serious condition".
This brought the number of self-immolation in London to four, after a 38-year-old Iranian man set himself on fire outside the French Embassy on Tuesday and an Iranian woman torched herself on Wednesday.
The protests came after a French anti-terror police stormed homes and offices of the People's Mujahedeen, rounding up 165 members of the Iranian opposition group.
Other self-immolations have taken place in recent days in Paris,Rome and Bern in protests at the crackdown on People's Mujahedeen.
The group has been listed by the European Union as one of the banned terrorists organizations since last year.