The army took control of Kohat and Hangu cities of the restive Khyber-Pakhtunkhwa province after curfew was clamped following an attack on an imambargah or Shia prayer hall at Zargaranabad in Kohat district.
Protests were also organised in Rawalpindi over the sectarian clashes on Friday that left 10 dead and over 50 injured.
Police officer Mazhar Jaan was quoted by Dawn newspaper as saying that unidentified persons attacked the imambargah in Kohat this morning. Two policemen and a civilian were killed in an exchange of fire between two rival groups, he said.
Activists of the Ahl-e-Sunnat Wal Jamaat, a front for the banned Sipah-e-Sahaba, had organised a rally in Kohat city to protest the clashes in Rawalpindi.
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The federal government issued orders for strict action against anyone propagating sectarianism through social media or mobile phones in the wake of the clashes.
The Information Technology Ministry and the Federal Investigation Agency (FIA) were directed to monitor social media for controversial statements that could lead to sectarian conflict and to take measures against those spreading such content.