A policeman was killed on Sunday in a gunfight between security forces and militants in Jammu and Kashmir's Poonch district, officials said.Police said the militants started firing from an under construction mini secretariat building near the Army's 93 Brigade headquarters in Poonch town around 8 a.m."The militants have been surrounded and all escape routes were sealed", a senior police officer told IANS, adding the gunfight was continuing.