The United States military and Iraq launched a joint raid targeting suspected Islamic State group militants in the country’s western desert that killed at least 15 people and saw seven American troops hurt, officials said Saturday.

For years after dislodging the militants from their self-declared caliphate across Iraq and Syria, U.S. forces have continued fighting the Islamic State group, though the casualties from Friday’s raid were higher than others in previous ones.

The U.S. military’s Central Command alleged the militants were armed with “numerous weapons, grenades, and explosive ‘suicide’ belts” during the attack, which Iraqi forces said happened in the country’s Anbar Desert.