On 14 February 1986, Freeport Indonesia received information that the OPM was again becoming active in their area, and that some of Freeport's employees were OPM members or sympathisers. On 18 February, a letter signed by a "Rebel General" warned that "On Wed. 19th, there will be some rain on Tembagapura". At around 22:00 that night several unidentified people cut Freeport's slurry and fuel pipelines by hacksaw, causing "a substantial loss of slurry, containing copper, silver and gold ores and diesel fuel." Additionally, the saboteurs set fire along the breaks in the fuel line, and shot at police that tried to approach the fires. On 14 April of that same year, OPM insurgents cut more pipelines, slashed electric wires, vandalised plumbing, and burned equipment tyres. Repair crews were attacked by OPM gunfire as they approached the sites of the damage, so Freeport requested police and military assistance.