The government on Wednesday said that intrusion has been seen from China in past two years. In a written reply to the Rajya Sabha, Minister of State for Home Mr. Mullappally Ramachandran said that intrusion has been noticed along the Line of Actual Control in Ladakh, Uttarakhand, Sikkim, and Arunachal Pradesh.<br/><br/>Mr. Ramachandran said that the intrusions are generally carried out on foot, vehicles, boats and even helicopters. The minister added that it is felt that intrusions occur because of difference in perception of LAC.<br/><br/>In reply to a question on the steps taken to prevent intrusion, the minister said, no such protection wall or fence exists along the border and most of the area is in high altitude and mountainous terrain. He added that ITBP has been deployed on the border and regular presence and round the clock patrolling and surveillance is carried out by ITBP.<br/>