The U.S. Justice Department says another man has been charged in the state of Minnesota with providing assistance to Somalia's al-Shabab militants.

Ahmed Mahamud was arrested Thursday in Ohio and is expected to be sent to Minnesota to face the indictment.

Prosecutors allege Mahamud conspired to provide both money and fighters for the al-Qaida-linked al-Shabab, which the U.S. government has designated a terrorist group.

More than 20 young men have traveled from Minnesota to Somalia in recent years, allegedly to train with al-Shabab.

At least 18 people have been charged in Minnesota during a U.S. investigation into the recruitment efforts.

Al-Shabab has controlled much of Somalia's capital, Mogadishu, and large sections of central and southern Somalia for at least three years. The Somali government and African Union forces, however, have retaken parts of Mogadishu in an offensive that began in February.

Al-Shabab is trying to overthrow the United Nations-backed government and set up a strict Islamic state.