California’s Santa Monica police may have prevented West Coast mass shooting today, by arresting a armed man with explosives heading to the areas’s gay pride parade.

Authorities in Santa Monica found possible explosives as well as a cache of weapons and ammunition Sunday in the car of a man who told them he planned to look for a friend at the L.A. Pride festival in West Hollywood, a law enforcement source said.

Federal and local law enforcement decided against canceling the annual parade, which went forward Sunday morning under tightened security. Investigators are now trying to piece together what happened but said they don’t believe there is any connection between the incident and the massacre at a gay nightclub in Orlando, Fla., that killed at least 50 people overnight.

Early Sunday, Santa Monica police received a call about a suspected prowler near Olympic Boulevard and 11th Street. Patrol officers responded and encountered an individual who told officers he was waiting for a friend, according to a law enforcement source familiar with details of the arrest. That led officers to inspect the car and find several weapons – including three rifles, one of them an “assault rifle” — and a lot of ammunition as well as tannerite, an ingredient that could be used to create a pipe bomb, said the source. The car had Indiana plates.

The man was detained after receiving a tip:

A tipster called police early Sunday morning about a prowler and found the suspect nearby. The suspect was arrested around 5 a.m. local time.

Police said they “were not aware of what the suspect’s intentions were at this point.”

The incident is not thought to be connected to Sunday’s shooting at a gay nightclub in Orlando.

Participants at the LA Pride parade held a moment of silence for the victims in Orlando.

Security has been tightened at all of Southern California’s theme parks:

Law enforcement agencies have stepped up security at theme parks in Southern California following the deadliest mass shooting in U.S. history.

The Los Angeles County Sheriff’s Department confirmed to The Hollywood Reporter that more deputies would be in and around Universal Studios on Sunday. Patrols in Universal City have also increased, authorities said.

Anaheim police told THR the department takes Disneyland “very seriously” and the park would be closely watched. He added that the park always has a high police presence.