Shots were fired at a bus convoy carrying 60 employees of PT Freeport Indonesia, said a senior company official Tuesday.

The attack happened Tuesday morning and resulted in two employees being injured, said Mindo Pangaribuan, the company's spokesman.

One employee was shot in the thigh and arm, while the other was shot in the hand and wrist. Pangaribuan said the employees are receiving medical treatment at a nearby hospital and are in stable condition.

Police are on the scene and an investigation is underway, said Pangaribuan.

Milling and mining operations of the company, which runs one of the world's largest copper and gold mines, haven't been affected, he added.

-By Fawziah Selamat, Dow Jones Newswires; +62 21 3983 1277; fawziah.selamat@dowjones.com