One of Britain's oldest anarchist publishers says its east London bookshop has been firebombed.

Freedom Press - set up more than 100 years ago - said Friday that no one was injured in the overnight fire, but that its shop and electrics "have been seriously damaged."

The publisher said on its Twitter page that it doesn't know who is responsible for the blaze.

London's Metropolitan Police said it was called by the fire brigade around 5:30 a.m. to reports of a fire in progress at the bookshop on Whitechapel Road.

Police say the incident is being treated as suspicious and that inquiries into the blaze's circumstances are under way.