The police in California, USA say a hotel worker may have prevented a mass shooting after the worker reported that a disgruntled colleague had threatened to shoot staff and guests.
Acting on the tip-off, officers arrested a 37-year-old man who was found to have high-powered weapons and ammunition at his Los Angeles home.
A BBC report says it comes amid a wider FBI effort to prevent such shootings.
That followed attacks in El Paso and Dayton that killed 31 people.
Since then US authorities say they have foiled a series of alleged plots to carry out attacks, some of which would have targeted minority groups.
The FBI has reportedly instructed its field offices to conduct threat assessments and has also urged the public to report threats or suspicious activity.