Nearly 50 people were treated for alcohol-related illnesses at a weekend Keith Urban concert, where authorities say the crowd of 18,000 got out of hand.

During the Saturday night show in Mansfield, Mass., about 30 miles south of Boston, police and fire officials from five surrounding communities tended to at least 46 people, while 22 were transported to area hospitals.

More than 50 were taken into protective custody at Mansfield's Xfinity Center and some are set to face charges, according to police.

“Last evening’s Keith Urban concert was not anticipated to present with the volume of issues handled, but measures were in place to provide appropriate and adequate care and protection to all patrons," Mansfield Fire Chief Neal Boldrighini and Police Chief Ronald Sellon said in a joint statement on July 27.

"This was our worst night that I know of this year," Mansfield County Selectman Chairman George Dentino told the Sun Chronicle.

“This one just exploded and exploded early," he added. "The country fans of yesterday aren’t the country fans of today, who are predominantly 17 to 28 and female. The primary reason for them going there is to party and secondary to that is to listen to the music.”

Officials say country concerts at the outdoor venue have been particularly problematic because they attract a younger and rowdier crowd.