Most of the suicide bombers were foreigners.
Via Business Insider:
The Islamic State utilized at least 13 suicide bombers in an attack on the city of Ramadi on March 12, the besieged capital of the western Iraqi province of Anbar.
Many of these suicide bombers were foreigners, and included a Belgian, an Australian, a Chechen, an Uzbek, a Moroccan, a Tunisian, an Egyptian, and two Syrians.
Iraqi officials have not disclosed the number of people killed in the suicide assault, but medical officials in the area told Reuters that five were killed. This toll has not been confirmed and could likely be much higher.
The attacks came from the directions of Albu Aytha, to the northeast of Ramadi, and Albu Diab, which is northwest of the city center, according to Shafaaq News. Iraqi officials said that security forces were able to repel the attack, and some sources claimed that Iraqi Security Forces and Sunni tribal fighters killed 41 Islamic State fighters. The number of Islamic State fighters killed during the attack on Ramadi could not be confirmed.
One suicide bomber was able to detonate on a bridge in the western portion the city, Reuters reported. The Islamic State has released several images from the attack, including one that shows a suicide bomber detonating on the Japanese bridge in the city.