A Pakistani military court has convicted seven people of launching a siege on the army headquarters and sentenced the alleged ringleader to death.

An official told reporters Saturday the man to be executed is a retired soldier known as Aqeel or Dr. Usman. Four others — a second retired soldier and three civilians — were sentenced to life in prison, while two other civilians received seven-year sentences.

The official, who requested he not be named, did not give any other details about the seven men or their precise involvement in the attacks which happened two years ago. He also did not specify where or when the trial was held.

The Taliban militant group has claimed responsibility for the October 2009 siege on Pakistan's army headquarters in Rawalpindi. Militants took control of the compound for 22 hours, holding 39 people hostage before Pakistani commandos stormed in and retook the base. Ten soldiers were killed during the intense battle, as well as four civilians and nine militants.