Well-trained terrorists, the challenging terrain, dense forests and now inclement weather have all played a role in the encounter in Jammu and Kashmir's Anantnag stretching into the fourth day on Saturday. Three officers, Colonel Manpreet Singh and Major Aashish Dhonchak of the 19 Rashtriya Rifles and Deputy Superintendent Himayun Bhat of the Jammu and Kashmir Police, have been killed in action, a soldier is missing and at least two more personnel have been injured.