The week-long police hunt for Abdul Shokoor Ezedi came after a mother and her two girls were hurt.
Police looking for the Clapham chemical attack suspect have raided two addresses in North Tyneside, including where he worked.
Officers have been searching for nearly eight days for Abdul Shokoor Ezedi, 35, who is wanted for attempted murder after a mother and her two children were injured by a corrosive liquid.
Armed police raided the addresses in the early hours of Thursday, Metropolitan Police said.
No arrests were made.
The addresses were associated with Ezedi, including his place of work, as part of a joint operation with Northumbria Police.
Ezedi was last seen on 31 January crossing Vauxhall Bridge Road into Grosvenor Road, in the Pimlico area at 23:03 GMT.
The latest raids are part of a string of searches at addresses in London and the north of England, where he lived in Newcastle.
Police believe Ezedi may be being helped to evade capture.