Washington, Aug 11 (IANS/AKI): Jihadists have flooded internet with anti-British messages inciting rioters to take further action, US-based terrorist tracking group SITE Intelligence has said.

Postings on jihadist websites have urged Muslim militants to incite the rioters via social media that could possibly lead to Arab-style protests in Britain, SITE said.

In a message on the Shumukh Al-Islam website, an extremist said the riots could be "useful" for the jihadist cause. He suggested Britain could withdraw troops from Afghanistan and send them to London to quell the violence.

Another post on the website advised jihadists to "infiltrate the British Facebook and Twitter" pages with catchy slogans such as "We are all Mark Duggan".

On another website, Ansar Al-Mujahedeen, users provided links to the Facebook pages of top British football clubs such as Manchester United and Arsenal, urging militants to post key slogans there, SITE said.

The SITE group constantly monitors internet and traditional media for material and propaganda released by jihadist groups and their supporters.

The death of Mark Duggan, taxi-driver and alleged drug supplier ina police shootout, sparked the violence in the country. Police have held over 1,100 people over the looting and unrest, which analysts say were largely organised by young people using the Blackberry smartphone's messaging service, micro-blogging website Twitter and other social networking websites.