BANDA ACEH, Indonesia (AP) _ Four people, including a policeman, were injured in two separate shootings in Indonesia's troubled northwestern Aceh province ahead of parliament elections Monday.

Unidentified gunmen fired from a car at a police station in Pringgading, a town in the Pidie district, on Saturday. A special forces private was seriously injured, said local police chief Lt. Col. Sirwandi Laut Tawar.

Two hours later, in the Pidie district's capital of Sigli, police mistakenly fired on a minibus, wounding three passengers. They had been aiming at a car behind the minibus that was carrying gunmen who had fired on another police station nearby, Sirwandi said.

The incidents were the latest in a series of violence acts that have plagued Aceh in the runup to the election. Separatists in the province want the vote called off and replaced by an independence referendum.

On Saturday, armed separatist gangs ordered passengers off four buses and set the vehicles afire along with two school buildings near Lhokseumawe, capital of oil-rich and riot-torn North Aceh, where the local government has imposed an overnight curfew.