The Security Council,

Recalling its resolutions 425 (1978) and 426 (1978) of 19 March 1978, 501 (1982) of 25 February 1982, 508 (1982) of 5 June 1982, 509 (1982) of 6 June 1982 and 520 (1982) of 17 September 1982, as well as all its resolutions on the situation in Lebanon,

Having studied the report of the Secretary-General on the United Nations Interim Force in Lebanon of 19 January 1999 (S/1999/61) and taking note of the observations expressed and the commitments mentioned therein,

Taking note of the letter dated 8 January 1999 from the Permanent Representative of Lebanon to the United Nations addressed to the Secretary-General (S/1999/22),

Responding to the request of the Government of Lebanon,

1. Decides to extend the present mandate of the United Nations Interim Force in Lebanon for a further period of six months, that is until 31 July 1999;

2. Reiterates its strong support for the territorial integrity, sovereignty and political independence of Lebanon within its internationally recognized boundaries;

3. Re-emphasizes the terms of reference and general guidelines of the Force as stated in the report of the Secretary-General of 19 March 1978 (S/12611), approved by resolution 426 (1978), and calls upon all parties concerned to cooperate fully with the Force for the full implementation of its mandate;

4. Condemns all acts of violence committed in particular against the Force, and urges the parties to put an end to them;

5. Reiterates that the Force should fully implement its mandate as defined in resolutions 425 (1978), 426 (1978) and all other relevant resolutions;

6. Encourages further efficiency and savings provided they do not affect the operational capacity of the Force;

7. Requests the Secretary-General to continue consultations with the Government of Lebanon and other parties directly concerned with the implementation of the present resolution and to report to the Security Council thereon.