Mosul (Iraq), Dec 9 (IANS/EFE): The Islamic State (IS) Sunni radical group has executed one of its own leaders after finding him guilty of financial corruption, conspiracy and negligence in the northern Iraqi city of Mosul.

A local official who preferred to remain anonymous for security reasons, told Efe news agency Tuesday that the person executed by IS was Moammar Tawhala, the official in charge of tax collection in Mosul.

The source added that Tawhala was executed Monday in front of his house in the Al Naggar neighbourhood of Mosul after a representative of a Sharia court formed by the IS notified Tawhala of the charges against him.

Tawhala was married to the sister of another jihadi, Radwan al-Hamduni, who was appointed "governor" of Mosul last June when IS fighters overran the city.

Al-Hamduni was killed last November in an airstrike by the US-led international coalition.

IS militants also arrested Tawhala's brother, Fatian, who was a lieutenant colonel in the secret services of the regime of former Iraqi president Saddam Hussein.

IS is currently looking for Tawhala's sister, Niran, who is responsible for accounting in the water directorate in Nineveh province.

Niran used to work as an inspector for IS, and is alleged to have extorted money from officials and contractors by threatening to report them to the IS.

The jihadi radicals have executed some of their own officials in recent months, leading to the formation of a standing committee on executions.

June 10, IS seized control of Mosul, Iraq's second most important city, and spread out from there to other areas in the country's northern and eastern provinces, forcing thousands of people to flee their homes.

The jihadi group declared an "Islamic caliphate" in the areas that it controls in Iraq and Syria, where it has imposed a radical interpretation of Islamic Sharia law, and expelled many Iraqis belonging to religious minorities.