Los Angeles Mayor Eric Garcetti says a heavily armed man arrested in Southern California told police he was in the area for West Hollywood's gay pride parade.

Garcetti announced the arrest Sunday while attending the LA Pride kickoff. Police in Santa Monica planned a news conference to discuss the arrest.

Authorities did not know of any connection between the gay nightclub shooting in Orlando, Florida, early Sunday and the Santa Monica arrest.

FBI spokeswoman Laura Eimiller told City News Service that the agency was assisting the Santa Monica Police Department with the arrest of an individual," but would not supply any more details.

Tens of thousands have gathered in West Hollywood for the annual LA Pride.

Los Angeles County sheriff's officials say they're assisting with the investigation and there is no immediate threat.