An Indian courtinfo-icon Monday sentenced two alleged leaders of a homegrown militant group and three others to death over twin bomb blasts in 2013 that killed 18 people.

Yasin Bhatkal, his brother Riyaz -- alleged co-founders of the Indian Mujahideen -- and three associates were found guilty of the blasts in February 2013, when two bombs strapped to bicycles exploded in a crowded marketplace in the southern city of Hyderabad.

Riyaz, who allegedly orchestrated the explosions, is on the run and remains on the nation's most-wanted list while the other four were in court.

Apart from the 18 dead, 131 people were wounded, according to the National Investigation Agency (NIA), which carried out a probe into the case.

"All five, who were charged with murder, treason, terrorist act, have been awarded the death sentence," a lawyer involved in the case told reporters.

"The judge said that after going through the entire record... that this case especially, on facts and circumstances, falls under the category of rarest of rare."

The Supreme Court says capital punishment should only be carried out in "the rarest of rare" cases in Indiainfo-icon, among a dwindling group of nations that still have the death penalty.

The lawyer said all five would appeal the verdict, which was passed by a special NIA court in Hyderabad after examining 157 witnesses.