Former Glee actress Naya Rivera has gone missing at a lake in Southern California, the Ventura County Sheriff's Department said.
A search operation was launched after her four-year-old son was reportedly found alone on a rented boat at Lake Piru.
The search will resume "at first light" on Thursday, the sheriff's department said.
Naya Rivera at Womens Guild Cedars-Sinai Annual Luncheon held at Beverly Wilshire Four Seasons Hotel on November 06, 2019 in Beverly Hills, California, United States (Photo by JC Olivera/Sipa USA)
BEVERLY HILLS, LOS ANGELES, CALIFORNIA, USA - SEPTEMBER 19: Naya Rivera arrives at the Los Angeles Premiere Of Roadside Attraction's 'Judy' held at the Samuel Goldwyn Theater at the Academy of Motion Picture Arts and Sciences on September 19, 2019 in Beverly Hills, Los Angeles, California, United States. (Photo by Xavier Collin/Image Press Agency/Sipa USA)
LOS ANGELES - AUGUST 13: Naya Rivera at FOX's 'Teen Choice 2017' at the Galen Center on August 13, 2017 in Los Angeles, California. (Photo by Frank Micelotta/FOX/PictureGroup)
Actress Naya Rivera attends the 24th Annual Race to Erase MS Gala at The Beverly Hilton Hotel in Beverly Hills, CA on May 5, 2017. (Photo by CraSH/imageSPACE) *** Please Use Credit from Credit Field ***
31 October 2014 - Los Angeles, California - Naya Rivera. UNICEF's Next Generation Presents 2nd Annual UNICEF Masquerade Ball Held at The Masonic Lodge at Hollywood Forever. Photo Credit: F.Sadou/AdMedia/Sipa USA
31 October 2014 - Los Angeles, California - Ryan Dorsey, Naya Rivera. UNICEF's Next Generation Presents 2nd Annual UNICEF Masquerade Ball Held at The Masonic Lodge at Hollywood Forever. Photo Credit: F.Sadou/AdMedia/Sipa USA
18 March 2014 - Los Angeles, California - Naya Rivera. 2014 The 'Glee' 100th episode celebration held at Chateau Marmont. Photo Credit: Tonya Wise/AdMedia/Sipa USA
8 January 2014 - Los Angeles, California - Naya Rivera. 40th Annual People's Choice Awards - Arrivals held at Nokia Theatre L.A. Live. Photo Credit: Russ Elliot/AdMedia/Sipa USA
Naya Rivera attends the 2014 People's Choice Awards, held at Nokia Theatre L.A. Live in Los Angeles, California, Wednesday, January 8, 2014. (Photo by Jennifer Graylock/Sipa USA)
11 December 2013 - Beverly Hills, California - Naya Rivera, Big Sean. The Hollywood Reporter's Women In Entertainment Breakfast Honoring Oprah Winfrey at Beverly Hills Hotel. Photo Credit: Kevan Brooks/AdMedia/Sipa USA
24 November 2013 - Los Angeles, California - Naya Rivera. 2013 American Music Awards - Arrivals held at Nokia Theatre LA Live. Photo Credit: Byron Purvis/AdMedia/Sipa USA
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Rivera, 33, is best known for playing Santana Lopez on musical comedy series Glee.
According to local reports quoting the sheriff's department, Nivera rented a boat at Lake Piru at about 1pm local time.
The alarm was raised and a search operation launched using helicopters, drones and dive teams, police said.
On Tuesday, Rivera tweeted a picture of her and the boy together, which was captioned: "Just the two of us."