ISLAMABAD  -   The Ministry of Interior and other concerned departments will brief the Senate Standing Committee on Interior on maintaining law and order and national security with special reference to influx of illegal immigrants and Afghan refugees due to the war-like situation in the neighbouring country as the Senate body holds its in-camera session here today. According to officials, the situation in Afghanistan poses a serious threat to Pakistan. However, they said that as part of the border management regime, an elaborate security mechanism has been deployed along the western border. Over the period of time, these measures have proved to be very effective in controlling illegal immigrants. They said though intermittent incidents of smuggling occur across the area of responsibility of the FC KP but an effective anti-smuggling / narcotics mechanism has significantly reduced such illegal attempts.  The sources said that the committee would be briefed on the major infrastructure developed as part of the border management regime. These include construction of 54 forts in Bajaur district, 61 in Mohmand and 90 in Khyber. Besides this, solar lights, movement detection radars, thermal weapon sights and other measures have been put in place to check movement of illegal immigrants. The officials said that all illegal crossings have been blocked and movement is allowed only across Angoor Adda crossing on production of legal documents.