An Iraqi court adjourned a hearing Sunday to allow a man to formalize his religious marriage to a 12-year-old girl, according to a lawyer for the girl's mother, who opposes the union.

Rights activists protested outside the Baghdad court with banners such as "the marriage of minors is a crime against childhood", while lawyer Marwan Obeidi told AFP the case had been postponed until Nov. 28.

The legal age for marriage in Iraq is 18 but can be lowered to 15 in cases of parental or judicial consent, according to charity Save the Children.

"Religious marriages are not permitted outside civil or religious courts but these types of marriages still happen regularly and can be formalised on the payment of a small fine," it said in a recent report.

The mother, who refuses to be identified, said her daughter Israa had been "raped" and that the girl's father kidnapped her.

But a department of the interior ministry dealing with violence against women said in a statement that it had met with Israa, her father and husband, seen the religious contract, and said she had assured them she had not been coerced.

Child marriage is not uncommon in conservative and rural areas of Iraq, as well as in other Arab countries.