London chemical attacker: Desperate police PLEAD for help as £20,000 reward offered with officers CLUELESS to his whereabouts

Investigators believe there are people who know where he is who have not come forward. They warned anyone found assisting him faces arrest.

An extensive police operation led by the Metropolitan Police Service continues, as dozens of officers work with others to locate him.

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. Our inquiry line is staffed 24/7 by specialist detectives who are progressing enquiries around-the-clock.

"If you know where he is or have information that may assist call them now."

The last confirmed sighting of him is now at 9.33pm on January 31, when he exited Tower Hill Underground station.

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He had changed trains at Victoria, where he arrived on the Victoria Line at 9.10pm and departed on the eastbound District Line at 9.16pm.

Commander Savell added: "I can also provide an update today on laboratory analysis of the substance from the attack site.

"The liquid used in the attack was a very strong concentrated corrosive substance, either liquid sodium hydroxide or liquid sodium carbonate.

"Further enquiries are ongoing including comparison with the containers seized from Ezedi’s address in Newcastle."

In an appeal directly to Abdul Ezedi, Darius Nasimi, of the charity the Afghanistan & Central Asian Association said: “Abdul, I am speaking directly to you. I want you to go straight to a police station immediately.

"You have a serious injury that needs to be seen to but, more importantly, you must do the right thing and hand yourself in to police. This has gone on for long enough.

"You can contact the charity if you wish and we can speak to you, and work together so that you can help the police with their enquiries.

"Abdul, please contact us as soon as you can, call 999, or go to a police station."