A reward of up to £20,000 is on offer for information leading to the arrest of suspected Clapham chemical attacker Abdul Ezedi.
Investigators believe there are people who know where he is who have not come forward.
They warned anyone found assisting him faces arrest.
Ezedi is suspected of attacking a 31-year-old woman and two children with a corrosive substance on Wednesday night.
On Sunday afternoon, the Metropolitan Police updated their most recent sighting of him, saying that the 35-year-old was seen at 9.33pm when he exited Tower Hill Underground station. This suggested he continued his journey from the previous sighting point at King's Cross.
Commander Jon Savell said: “I am hugely grateful to the public for the significant number of calls that we have received.
“Your help is critical. A reward of up to £20,000 is now available for information leading to his arrest.
“I must warn anyone who is helping Ezedi to evade capture - if you are harbouring or assisting him then you will be arrested."
