A 15-year-old boy and a 54-year-old man have been arrested on suspicion of arson with intent to endanger life after a fire at a restaurant in Ilford which left five people injured.
Emergency services were called to Indian Aroma in Woodford Avenue, Gants Hill, at about 9pm on Friday.
Five people, three women and two men, were injured in the incident.
Two of them, a man and a woman, remain in a life-threatening condition, the Metropolitan Police said.
It is also believed there are two further victims who left the scene before officers arrived, the force added.
Efforts remain ongoing to identify them.

Two people, a 15-year-old boy and 54-year-old man were arrested on Sunday on suspicion of arson with intent to endanger life and remain in police custody, the force said.
Detective Chief Inspector Mark Rogers, of the Met’s central specialist crime north unit said: “While we have made two arrests, our investigation continues at pace so we can piece together what happened on Friday evening.
“I know the community are concerned and shocked by this incident.
“I would urge anyone with any information or concerns to come forward and speak to police.”
Anyone with information is urged to contact the Met via 101, quoting 7559/22AUG. If you wish to remain anonymous, speak with Crimestoppers on 0800 555 111.