A major security investigation unfolded in Southern California after authorities detained an armed man near one of President Donald Trump’s properties just before the president’s arrival.

Federal and local law enforcement agencies are now working together to determine whether the incident was an isolated weapons case or something more serious.

The arrest triggered an immediate response from multiple agencies responsible for protecting the president, prompting investigators to examine the suspect’s movements, statements and the items recovered during the investigation.

Although officials say there is no confirmed plot at this time, they continue to describe the case as active.

An armed man was arrested outside Trump National Golf Club in Rancho Palos Verdes, California, after federal agents reported suspicious activity on the property before President Donald Trump’s scheduled visit, according to the Los Angeles County Sheriff’s Department.