Police, state and federal agents served a search warrant Thursday at a Los Angeles home where hazardous materials were believed to be involved, leading to the call out of a hazardous materials crew and the detention of three people.

The raid occurred about 3:30 p.m. at a residence in the 8500 block of Alcott Street on the edge of the Pico-Robertson and Mid-City neighborhoods, according to LAPD Officer Mike Lopez.

A state warrant was being served at the home, according to FBI spokeswoman Laura Eimiller.

Lopez said that U.S. Postal Inspectors also were involved.

The investigation involved hazardous materials being sent through the mail, authorities said, but what those materials were reported to be was not disclosed.

Surrounding residences were evacuated during the investigation, according to Lopez, who said three people were detained.