The Metropolitan Police has released new footage of officers entering a property in Newcastle as part of the search for Abdul Ezedi.
Ezedi is being hunted over an attack with a corrosive substance in south London on Wednesday that has left a woman with life-changing injuries.
Searches have taken place at two addresses in east London and three in Newcastle.
The force said the property had empty containers with corrosive warnings on the labels, which were recovered from the address.
Searches relating to Abdul Ezedi have taken place at two addresses in east London and three in Newcastle
PA/Met Police
Commander Jon Savell said: "Abdul Ezedi was last seen at King's Cross Underground Station at 21:00hrs on Wednesday, 31 January, where he boarded a Victoria Line train travelling southbound. The police investigation to establish his subsequent movements and ultimately locate him is continuing at pace.
"I want to thank everyone who has contacted police to share what they know. We have received dozens of calls with information, including possible sightings, and every single piece of information has been recorded and forms part of our ongoing investigation.
"I can assure the public that my colleagues and I are fully committed to using every available tool and tactic for as long as it takes to find Abdul Ezedi.
"I am today urging the public to remain vigilant and to contact police immediately if they may have seen Ezedi or have information about him. I would also like to reiterate that if you see Ezedi, you should call 999 immediately. He should NOT be approached."
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One of the containers recovered from the Newcastle property
Metropolitan Police
Forensic tests are currently ongoing to see if the containers held the substance used in the attack.
A Met Police spokesperson said the investigation team has received dozens of calls and is working with a large number of police services and other agencies.
Officers from Scotland Yard are working with other organisations, including British Transport Police, Northumbria Police, the National Crime Agency and Transport for London.
The 31-year-old woman injured in the attack remains in a critical but stable condition in hospital having suffered what are likely to be life-changing injuries. She was known to Abdul Ezedi.
Abdul Ezedi is still on the run after throwing an alkaline substance at a mother and two daughtersMetropolitan PoliceAnyone with information about Abdul Ezedi is asked to call 020 7175 2784 or for an immediate sighting dial 999.
Three women and a man attempted to stop the attacker as he fled the scene. He tried to leave in a car, but he collided with a parked vehicle and then ran on foot towards Clapham Common.
Three members of the public, who came to the aid of the family, have all been discharged from hospital with minor burns.
Five officers who attended the attack were also treated and have now left hospital.