Militants in north-west Pakistan have beheaded six security officials and killed seven civilians in apparent reprisals for an army attack.
The army attack on the stronghold of pro-Taleban militant Maulana Fazlullah on Thursday left at least 17 soldiers and a number of civilians dead.
The bodies of the guards reportedly had notes saying they were American agents.
Swat is one of a number of areas near the Afghan border where militants have been gaining control in recent months.
"It is the fate of an American agent. Whoever works for America will face the same fate."
Sirajuddin, a spokesman for Maulana Fazlullah, said the killings were carried out by "common people, who support us because we only want enforcement of Islamic laws".
Security forces dropped leaflets on Saturday urging residents to "eliminate extremism and terrorism from the Swat valley".
clipped from: news.bbc.co.uk