Four people were arrested in a drug raid at the Riverside Trailer Park in Old Town on Thursday, police said.

During the course of the investigation, officers from the Old Town Police Department seized $3,600 in cash, more than 150 prescription pills, a loaded firearm and a drug suspected to be Molly, the department said in a news release on Friday.

Phillip Bryant, 28, was charged with unlawful trafficking of scheduled drugs and possession of a firearm by a felon. Terrence Robinson, 23, was charged with unlawful trafficking of scheduled drugs. Trisha Burke, 29, and Katelyn Fields, 20, were each charged with unlawful possession of scheduled drugs.

The investigation is ongoing, and more charges could be filed at a later date, the release said.