The firebombing of an migration processing centre was motivated by utmost right-wing violent ideology, constabulary person said.
Andrew Leak, 66, from High Wycombe, Buckinghamshire, threw up to 3 incendiary devices astatine the tract successful Dover, Kent, past Sunday.
He is believed to person aboriginal taken his ain life.
Counter Terrorism Policing South East (CTPSE) said grounds showed it "was motivated by a violent ideology".
Tim Jacques, elder nationalist co-ordinator for antagonistic coercion policing, said: "After considering the grounds collected truthful far, whilst determination are beardown indications that intelligence wellness was apt a factor, I americium satisfied that the suspect's actions were chiefly driven by an extremist ideology.
"This meets the threshold for a violent incident."
Leak was not known to counter-terrorism constabulary earlier the attack, CPTSE confirmed. It is understood helium was besides not known to the information services.
A now-deleted Facebook relationship seemingly successful Leak's sanction contained anti-Muslim sentiments.
Two members of unit astatine the centre were near with insignificant injuries aft constabulary were called astatine 11:22 GMT connected Sunday morning.
Following the onslaught astir 700 migrants were transferred from Dover to the processing centre astatine Manston, wherever overcrowded conditions had already been severely criticised by authorities inspectors.
A constabulary connection connected Saturday said: "A fig of important witnesses person been spoken to during the people of the probe and a fig of items of involvement person been recovered, including integer media devices.
"Evidence from examining these items suggests determination was an utmost right-wing information down the attack."
Police added determination was thing to suggest Leak had been moving alongside anyone other and determination was not believed to beryllium immoderate wider menace to the public.
They said the probe was ongoing, including enactment being carried retired connected behalf of the coroner.
An inquest into Leak's decease is expected to beryllium opened astatine County Hall successful Maidstone connected Tuesday.
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