A 40-year-old man from Liverpool, as well as a 35-year-old woman and a 32-year-old man, both from Shrewsbury, were arrested after officers spotted what they believed was a drug deal happening in Featherbed Lane, Sundorne, on Tuesday night.
All three have been released under investigation.
A West Mercia Police spokesman said: "At around 11am on Tuesday, May 18, officers from the Local Policing Priorities Team spotted what they believed to be a drug deal taking place on the car park of Featherbed Lane. They approached three people and one man left the scene in the direction of Battlefield Road.
"With the support of the Local Organised Crime Team, a 40-year-old man from Liverpool was stopped and arrested for possession with intent to supply Class A drugs. He has since been released under investigation.
"A 35-year-old woman and 32-year-old man, both from Shrewsbury, were arrested on suspicion for possession of Class A drugs, possession of Class B drugs and possession an offensive weapon. They have both also been released under investigation while the investigation continues."