Britain is bracing for clashes with right-wing extremists and possible copycat terror attacks after the slaying of a young soldier, adding some 1,200 police to potential trouble spots.

Images captured on video made for gruesome viewing — one man with bloodied hands and holding butcher's knives angrily complained about the presence of British troops in foreign lands.

Terror analysts said Friday the publicity was intentioned to inspire copycat attacks and they are already seeing an increase in chatter calling for such attacks on extremist sites.

A British government official who spoke on condition of anonymity because he was not authorized to speak about the ongoing investigation, confirmed the increase in chatter since Wednesday's attack but said there were no specific or credible plots detected at this point.