Radical cleric Abu Qatada is being investigated over extremist material, police said today.
The 52-year-old was arrested on March 8 for alleged bail breaches, and a hearing over whether he should be granted bail was due to be held today but has been delayed.
The hate preacher's house in north London was searched before he was held.
The material was from a range of sources including online, and police are investigating whether the publications were written by Qatada. They were in a variety of languages.
Deputy Assistant Commissioner Stuart Osborne said: "When we searched his house before his arrest that was a police search in relation to investigating some publications, to see if that was anything that reached a criminal threshold. There is an awful lot of media that needs to be looked through."
The Home Secretary pinned her hopes for ousting Abu Qatada from Britain on a fresh deal with the Jordanians.
A Tory MP and former government lawyer give their view on the UK potentially withdrawing from the ECHR to aid Abu Qatada's deportation.
The Government has been refused permission to take its fight to remove preacher Abu Qatada from the UK to the Supreme Court.