JAKARTA — An Indonesian military court on Wednesday (June 10) sentenced four military officers to jail terms of up to three years for their involvement in an acid attack on an activist known for campaigning against the growing role of the military.

One defendant was sentenced to three years in jail, a second to two and a half years, the third to two years and the fourth to one and a half years, judge Fredy Ferdian said, adding the first and second defendants were also dishonourably discharged from the military.

He said the attack was not influenced by any "chain of command".

The four officers were found guilty on charges of serious premeditated assault after attacking Andrie Yunus, a ‌deputy coordinator with the Commission for Missing Persons and Victims of Violence, a rights group also known as Kontras.

Responding to the ruling, the defendants' lawyers said they would consider an appeal.

The four soldiers were all members of Indonesia's military intelligence unit with ranks of captain, first lieutenant, and second sergeant, another judge Zainal said.

The first defendant was given the heaviest sentence because he was the one who executed the attack and "provoke" the others to join in, he added.