Tarn Taran, Jan. 31 -- Police on Thursday arrested four gangsters after a brief exchange of fire, injuring one of them, in Tarn Taran. With this, the police claimed to have busted a module linked with foreign-based terrorist Lakhbir Singh, alias Landa, US-based Gurdev Singh, alias Jaisal Chabhal, and Canada-based Satbir, alias Satta Naushehra....