Four people were killed in two separate armed attacks in Indonesia's Aceh province, police said Sunday. Attackers armed with AK-47 rifles opened fire at workers installing fiber optic cable for the state telecommunications company PT Telkom in Bireuen district late Saturday, killing three people, local police chief Yuri Karsono said. Seven other workers were wounded, he said. In a separate attack Saturday, two unidentified persons on a motorcycle shot dead a shopkeeper in the provincial capital Banda Aceh, Ibnu Hajar, a witness was quoted as saying by the German Press Agency "DPA".