NAIROBI, Kenya — Sudan has kick-started investigations into the long, bloody suppression of the Darfur region under the government of President Omar Hassan al-Bashir, a move aimed at ending years of impunity and bringing perpetrators to justice amid a fragile political transition.

The Sudanese attorney general, Taj al-Sir al-Hibir, said Sunday that the government would look into atrocities committed against civilians in Darfur beginning in 2003, in the first indication that Mr. al-Bashir and some of his allies could face charges related to human rights abuses in Sudan.

Mr. al-Bashir ruled Sudan with an iron fist for almost three decades — a tenure marked by human rights abuses, economic decline, and entrenched corruption. He was indicted a decade ago by the International Criminal Court in The Hague on charges of genocide, war crimes and crimes against humanity over his government’s actions in the Darfur region from around 2003 to 2008.

His rule came to an end in April after a months-long uprising and just over a week ago, the 75-year-old former leader was found guilty of corruption and illegal possession of foreign currency and sentenced to two years of detention. He faces other charges including some stemming from the crackdown that left scores of anti-government protesters dead this year and his role in the putsch that brought him to power in 1989.