According to Fajar Adriyanto, the Hawk 209 jet took off on Monday morning from the Rusmin Nuryadin Air Base in Pekanbaru and crashed in the village of Kubang Jaya.
"We are still investigating the cause of the accident and the number of casualties," Adriyanto told the newspaper.
Meanwhile, the pilot is being examined for injuries at the air force hospital in Pekanbaru.