The Indian Air Force is closely monitoring the situation along the Line of Actual Control (LAC) in Arunachal Pradesh following an attempt by the Chinese PLA troops last week to unilaterally change the status quo in the Tawang sector in the border state, people familiar with the development said on Tuesday.

They said the IAF has also stepped up its overall surveillance in the areas in view of the Chinese attempt of transgression on December 9, adding it follows standard operation procedures that included scrambling of fighter jets in case of specific security concerns.