The Islamic State of Iraq and al-Shams (Isis) has imposed a strict set of Sharia laws on the citizens of Nineveh province just days after capturing the provincial capital of Mosul.

In a document circulating on social media attributed to the group, Isis warned tribal leaders and sheikhs not to "work with [the Iraqi] government and be traitors" while proclaiming that women should only go outside if absolutely necessary.

"For women, dress decently and wear wide clothes. Only go out if needed," read the document as translated by Al Aan TV reporter Jenan Moussa.

Further rules included bans on drugs, alcohol and cigarettes while public gatherings, the possession of guns and the carrying of flags not of the Islamic state were outlawed.

The document added that Isis wish to destroy all shrines and graves, in reference to Shia shrines in towns such as Samarra where fighting is continuing.

"For those asking who are you? We are soldiers of Islam and took on our responsiblity to bring back glory of the Islamic Caliphate.

"Money we took from [the] Safavid government is now public. Only Imam of Muslims can spend it. Anyone who steals [will have their] hands cut," the document translation read.

ISIS rules: Our position on Shrines and graves is clear. All to be destroyed basically. (9/11) #Nineveh @akhbar — Jenan Moussa (@jenanmoussa) June 12, 2014

Isis have continued their push towards Baghdad, seizing a town only 56 miles (90km) north of the Iraq's capital, according to reports.

The flashpoint town of Dhuluiyah and the area of Muatassam have been overrun by militants following a three-day offensive the Iraqi government has failed to stop, according to AFP.

The group has become the richest terror force in the world after looting $429m and large amounts of gold bullion from Mosul's central bank following the city's capture.