A group of well-trained gunmen have stormed an Indonesian jail and killed four inmates accused of murdering a special forces soldier.
At least 17 masked men angry over the killing of a member of Indonesia's elite military unit, known as Kopassus, broke into the prison on the main island of Java, said police chief Brigadier General Dabar Rahardjo.
They were angry about the death of the member of Kopassus, allegedly by the four men detained in Yogyakarta's Cebongan prison
The attackers tortured several guards and forced them to open the jail cell.
The four detainees were dragged from their cell and shot with automatic weapons before the gunmen destroyed surveillance cameras and fled.
"They looked very professional," Brig Gen Rahardjo said. "Their acts were completed in just five minutes." He said the attack was apparently triggered by the murder of a Kopassus member on Tuesday at a Yogyakarta cafe.
Four suspects were arrested by police hours later and three others remain at large.
Police and military investigators were still collecting evidence from the scene, and several witnesses were being questioned. "Whoever did it should be immediately arrested and prosecuted," said Djoko Suyanto, co-ordinating minister for Political, Legal and Security Affairs.
Kopassus troops have been implicated in a range of war crimes and human rights violations over the years. Indonesian officials say they have worked to address the problems.
Earlier this month, dozens of Indonesian soldiers angry over the killing of a comrade by police, attacked and burned down a police headquarters and four other stations in South Sumatra province.