ST. LOUIS (AP) – Authorities say dozens of people have been treated in downtown St. Louis over several days after apparently overdosing on a synthetic cannabis-like drug.

St. Louis Fire Chief Dennis Jenkerson tells the St. Louis Post-Dispatch most of the people appeared to be homeless and were in the areas of New Life Evangelistic Center or the nearby Central Library branch. Jenkerson says 18 people were treated Monday, eight people were treated Tuesday along with more on Wednesday.

Authorities say some were found standing and walking around in a confused state, and others were found lying in the streets and on sidewalks.

Mayor Francis Slay’s chief of staff, Mary Ellen Ponder, says police and other city officials have talked with some of those who overdosed and believe they have a strong lead on who sold the drugs.