The militants opened fired and lobbed grenades at an Army camp in Meshwara area of Samba around 5:50 AM, security officials said.
Entire area has been cordoned off by the Army and police and firing exchanges are going on, officials said.
A civilian, who was passing by the area, fell off his cycle during the firing and was injured, Army said.
As per inputs received so far, two persons were possibly involved in the attack, Defence PRO Lt. Col Manish Mehta said Mehta said,
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"At 5.45 AM, the terrorists had opened fire and let me tell you nobody has been injured. No soldier or civilian has been injured. The individual, who has been injured, had fallen off from his cycle during the firing. It is not a bullet or a splinter injury," Mehta told reporters.
"They (attackers) were not trying to enter any unit. They have fired from outside and now they have been cordoned outside the army area," he added.
Officials said the Jammu-Pathankot Highway has been closed for vehicular traffic as a precautionary measure.