Sources said that intelligence agencies traced a phone call in which the terrorists they were plotting to attack school bus and wagons.
It was also said that the plan of carrying out the terrorist attacks was made from a hotel near the Pak-Afghan border.
The law enforcement agencies have instructed the educational institutes to take the preventive measures.
On the other hand, the authorities received a letter threatening to attack security check posts at the Wagah Border after which a search operation was launched.
It was not yet determined as to where the letter was sent from.
