Unattended children have been a headache for Pennsylvania’s gaming industry since the state’s first casino opened in 2006.

Wind Creek Bethlehem recently became the second facility in the state to present a mitigation plan to the Pennsylvania Gaming Control Board. It will spend more than $4 million to improve security throughout the property in the city’s South Side to look out for minors, who have been found alone in hotel rooms, lobbies and other common areas.

“These incidents have been occurring since casinos opened, but the number and frequency has increased as more casinos have opened,” PGCB spokesperson Doug Harbach said. “This gained the attention of the board, who has taken a high interest in how casinos are handling the problem.”