London, November 16 (RHC)-- Special forces have been deployed to back British police after Paris attacks that killed 129 people, British newspapers reported on Sunday, as part of a wider boost in security measures.

Interior Minister Theresa May did not deny the reports, telling the BBC that "arrangements" had been made to give the police military support where necessary, AFP reported.

British media reports said special forces were dressed in plain clothes and supporting police at busy public locations, including train and metro stations, shopping centers and popular entertainment districts. "There are tried and tested arrangements in place to give military support," Home Secretary Theresa May told the BBC when asked about the veracity of the reports. 

Britain's "severe" threat level, in place since August last year, remained unchanged after the Paris killings. The threat level means an attack is "highly likely," and the next highest level -- "critical" -- means an attack is imminent.

One Briton was confirmed killed in the coordinated assault on the French capital, and the government said several others were also feared dead.