MANISTIQUE -- Four people have been arrested in a drug bust conducted by the Upper Peninsula Substance Enforcement Team on Wednesday, according to police.

UPSET detectives made four arrests in the City of Manistique late on Wednesday night. Two women and a man were arrested for the delivery of prescription pills. Later in the evening, officials arrested another man for three counts of delivery of prescription pills and conducted a search warrant on his residence.

The arrests are the result of four separate investigations over the last six months. UPSET officials expect more arrests as the result of the investigations.