SAN JOSE — An investigation into illegal gambling led to the arrest of five people and the discovery of nearly three dozen guns, hundreds of thousands of rounds of ammunition and 500 pounds of illegal marijuana, police said Friday.

Officers arrested the three men and two women Wednesday after serving a warrant in the 2400 block of Autumnvale Drive, according to a statement from Lt. Jaime Jimenez. All five had various warrants out for them and were booked on unspecified multiple felony charges, he said.

Four of the suspects are San Jose residents, Jimenez said. A fifth is from Antioch. All five were taken to the Santa Clara County Jail.

According to Jimenez, police gained information that an illegal casino was operating at a commercial property and that drug sales and prostitution were occurring. The operation used several offices in the building, Jimenez said.

Police obtained a warrant to search the property and used the Violent Crimes Enforcement Team, METRO and the department’s Human Trafficking Task Force to help them.

Jimenez said police found 33 guns, including more than one assault weapon; 150,000 rounds of ammunition; the marijuana; and about $20,000 cash. He said the adult women working as prostitutes were provided with resources, assistance and information about their rights.

The investigation is ongoing, Jimenez said, and police are looking for more information from witnesses who may have come into contact with people at the building. Police encouraged anyone with information to email [email protected].