BAGHDAD, Iraq (CNN) -- A female suicide bomber detonated explosives outside a courthouse Wednesday in central Baquba, killing nine people, the Interior Ministry said.
Among the victims were five soldiers and a police officer, a ministry official said. The blast wounded 17 others.
The official said the woman, covered in a traditional black garment known as an abaya, blew herself up near a security checkpoint outside the courthouse.
Baquba is located about 35 miles north of Baghdad, inDiyala province.
On Tuesday, Iraqi authorities arrested a 38-year-old woman, Ibtisam Adwan, suspected of heading up the recruitment of female suicide bombers, Iraq's Defense Ministry said.
Adwan was arrested in a village east of Baquba, ministry spokesman Mohammed al-Askari said. She is suspected of being directly involved in the training of Rania Ibrahim, 15, who was caught at a market a few weeks ago with explosives strapped to her waist.
More than 30 female suicide bombers have triggered explosions so far in 2008. Half of them were in Diyala province.
CNN's Mohammed Tawfeeq contributed to this report.