"Four terrorists have been killed while one has been apprehended alive during an operation in Naugam sector," the official said.
All the militants were Pakistani nationals, sources said.
The operation was in progress when reports were last received from the encounter site.
The official said as the operation was still going on, it would be premature to say whether it was an infiltration bid or not.
"We have got one of them alive and expect some vital information from him," an army officer said.