Unknown attackers fired shots at a truck convoy belonging to Freeport McMoRan Copper & Gold Inc.'s (FCX) Indonesian operations over the weekend, but no-one was injured in the attack and mining operations were unaffected, the company said Monday.

PT Freeport Indonesia said in a statement that it has indefinitely suspended operations on part of the road that leads to its Grasberg copper and gold mine in Papua province in eastern Indonesia.

A company official said separately that the area of the road which has been closed is not within the company's mining area.

"Mine production and milling are running normally," PT Freeport spokesman Mindo Pangaribuan told Dow Jones Newswires.

PT Freeport has suffered a string of shooting attacks on its personnel and property since July. An Australian mine technician and an Indonesian security guard working for the company were killed last month in one such attack, sparking concerns over security.

-By Reuben Carder, Dow Jones Newswires; 62 21 3983 1277; Reuben.Carder@dowjones.com