Jakarta. Police investigators questioned retired Army general Kivlan Zen on Wednesday in relation to the arrests of six men who police say are involved in an assassination plot targeting four high-ranking officials and the head of a polling agency.

On the same day, Kivlan was also interrogated at the National Police headquarters in Jakarta as a suspect in a treason case.

The six suspects, led by H.K. as their "field operator," were arrested on May 21 and 24 in Jakarta, Banten and West Java.

Two of them, H.K. and T.J., were ordered by their as yet identified leader to buy weapons which were to be used to assassinate Chief Security Minister Wiranto, Coordinating Minister for Maritime Affairs Luhut Pandjaitan, National Intelligence Chief Budi Gunawan and presidential special staff Gories Mere.

HK was also ordered to kill the head of a polling agency, whose identity the police have not disclosed.

National Police chief Tito Karnavian said on Tuesday that the police already know the identity of the person who ordered H.K. and T.J. to plan and execute the assassination plot.

"H.K. was the field operator among the six suspects… he received the order from K.Z. [Kivlan Zen] to provoke the riots on May 21 and 22," National Police spokesman Brig. Gen. Dedi Prasetyo told Metro TV on Wednesday night.

He said the former chief of staff of the Army’s Strategic Command (Kostrad) is now still a witness in the case.

"He is still being interrogated, the results will be announced to the public soon," Dedi told the Jakarta Globe.

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