The death toll in the overnight anti-terror operation in Anantnag district of Jammu and Kashmir rose to three on Sunday as one of the two civilians injured in the encounter succumbed, officials said.     Abdul Rashid Dar, who was injured in terrorist firing on Saturday, succumbed to injuries at a hospital here early Sunday, the officials said.            Two Army personnel were killed and two civilians injured in a fierce gunfight with terrorists in the Ahlan Gagarmandu forest area of Anantnag district at an altitude of 10,000 feet on Saturday, officials said.