ST. ALBANS — St. Albans Police on Thursday arrested four people as suspects in an alleged marijuana growing operation. One of those already faces federal prosecution on separate drug charges.

Police today said that just before 3 p.m. Thursday, an officer was investigating suspicious activity at 26 Huntington St. and inadvertently discovered evidence of a marijuana cultivation.

After a search warrant was obtained, St. Albans Police seized in excess of 20 pounds of processed marijuana and more than 30 pounds of harvested, mature marijuana plants.

As a result of the investigation, four people were arrested: Bobby Joe Desrochers, 44, of St. Albans; Jesse Partlow, 29, of St. Albans; Amanda Hemingway, 26, of Swanton, and Nickoma Hayes, 30, of Swanton.

All four were taken into custody and charged with felonies for possession of marijuana. St. Albans City Police Chief Gary Taylor said other charges are likely, including counts of intent to distribute and cultivation of marijuana.

Yesterday, neighborhood residents and passersby gathered at the corner of Lake and Huntington streets as numerous law enforcement cruisers and officers, took part in the raid.

Desrochers was brought from the scene and lodged at the Northwest State Correctional Facility. Taylor said Desrochers already was on federal probation for conspiracy to important marijuana, cocaine and other controlled substances.

A search of records today showed that a Jesse Partlow, then 27, of Swanton Village, was cited in June 2011 after a court-approved search of his apartment resulted in confiscation of 41 marijuana plans and growing materials. Police at that time alleged that an in-door growing operation was being conducted in the dwelling on Depot Street.

Partlow, Hemingway and Hayes were released following their bookings yesterday and are all due in court on Oct. 28, said Taylor.