Media reports suggest that three vehicles, that were being tracked by the intelligence agencies, have gone untraceable in Punjab.
Twenty hostages, including 19-year-old Indian teenager Tarishi Jain, were hacked to death by terrorists in Dhaka inside the cafe popular with expats in the diplomatic zone before commandos launched an assault killing six attackers and capturing one alive.
Police in Dhaka after terror attack dnaindia
A similar warning was issued by the Punjab police in April about the entry of three heavily armed Pakistani terrorists who might be suicide bombers.
Meanwhile, an alert has also been sounded along the 856-km long border with Bangladesh in view of the terrorist attacks in Dhaka.